feat: introduces worker name option, use label on worker metrics instead (#1376)

* add worker name option and use it in logs and metrics, update tests

* fix missing reference for collector

* update tests

* update docs

* fix conflict

* add missing allowedDirectives

* update tests

caddy/caddy.go

@@ -45,6 +45,8 @@ func init() {
 }
 
 type workerConfig struct {
+	// Name for the worker
+	Name string `json:"name,omitempty"`
 	// FileName sets the path to the worker script.
 	FileName string `json:"file_name,omitempty"`
 	// Num sets the number of workers to start.
@@ -99,7 +101,7 @@ func (f *FrankenPHPApp) Start() error {
 		frankenphp.WithMaxWaitTime(f.MaxWaitTime),
 	}
 	for _, w := range f.Workers {
-		opts = append(opts, frankenphp.WithWorkers(repl.ReplaceKnown(w.FileName, ""), w.Num, w.Env, w.Watch))
+		opts = append(opts, frankenphp.WithWorkers(w.Name, repl.ReplaceKnown(w.FileName, ""), w.Num, w.Env, w.Watch))
 	}
 
 	frankenphp.Shutdown()
@@ -234,6 +236,11 @@ func (f *FrankenPHPApp) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
 				for d.NextBlock(1) {
 					v := d.Val()
 					switch v {
+					case "name":
+						if !d.NextArg() {
+							return d.ArgErr()
+						}
+						wc.Name = d.Val()
 					case "file":
 						if !d.NextArg() {
 							return d.ArgErr()
@@ -267,9 +274,10 @@ func (f *FrankenPHPApp) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
 							wc.Watch = append(wc.Watch, d.Val())
 						}
 					default:
-						allowedDirectives := "file, num, env, watch"
+						allowedDirectives := "name, file, num, env, watch"
 						return wrongSubDirectiveError("worker", allowedDirectives, v)
 					}
+				}
 
 				if wc.FileName == "" {
 					return errors.New(`the "file" argument must be specified`)
@@ -278,6 +286,14 @@ func (f *FrankenPHPApp) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
 				if frankenphp.EmbeddedAppPath != "" && filepath.IsLocal(wc.FileName) {
 					wc.FileName = filepath.Join(frankenphp.EmbeddedAppPath, wc.FileName)
 				}
+
+				if wc.Name == "" {
+					// let worker initialization validate if the FileName is valid or not
+					name, _ := fastabs.FastAbs(wc.FileName)
+					if name == "" {
+						name = wc.FileName
+					}
+					wc.Name = name
 				}
 
 				f.Workers = append(f.Workers, wc)

caddy/caddy_test.go

@@ -11,12 +11,12 @@ import (
 	"sync/atomic"
 	"testing"
 
-	"github.com/dunglas/frankenphp"
-	"github.com/prometheus/client_golang/prometheus/testutil"
-	"github.com/stretchr/testify/require"
-
 	"github.com/caddyserver/caddy/v2"
 	"github.com/caddyserver/caddy/v2/caddytest"
+	"github.com/dunglas/frankenphp"
+	"github.com/dunglas/frankenphp/internal/fastabs"
+	"github.com/prometheus/client_golang/prometheus/testutil"
+	"github.com/stretchr/testify/require"
 )
 
 var testPort = "9080"
@@ -370,17 +370,13 @@ func TestMetrics(t *testing.T) {
 
 	// Fetch metrics
 	resp, err := http.Get("http://localhost:2999/metrics")
-	if err != nil {
-		t.Fatalf("failed to fetch metrics: %v", err)
-	}
+	require.NoError(t, err, "failed to fetch metrics")
 	defer resp.Body.Close()
 
 	// Read and parse metrics
 	metrics := new(bytes.Buffer)
 	_, err = metrics.ReadFrom(resp.Body)
-	if err != nil {
-		t.Fatalf("failed to read metrics: %v", err)
-	}
+	require.NoError(t, err, "failed to read metrics")
 
 	cpus := fmt.Sprintf("%d", frankenphp.MaxThreads)
 
@@ -432,6 +428,8 @@ func TestWorkerMetrics(t *testing.T) {
 	}
 	`, "caddyfile")
 
+	workerName, _ := fastabs.FastAbs("../testdata/index.php")
+
 	// Make some requests
 	for i := 0; i < 10; i++ {
 		wg.Add(1)
@@ -444,17 +442,13 @@ func TestWorkerMetrics(t *testing.T) {
 
 	// Fetch metrics
 	resp, err := http.Get("http://localhost:2999/metrics")
-	if err != nil {
-		t.Fatalf("failed to fetch metrics: %v", err)
-	}
+	require.NoError(t, err, "failed to fetch metrics")
 	defer resp.Body.Close()
 
 	// Read and parse metrics
 	metrics := new(bytes.Buffer)
 	_, err = metrics.ReadFrom(resp.Body)
-	if err != nil {
-		t.Fatalf("failed to read metrics: %v", err)
-	}
+	require.NoError(t, err, "failed to read metrics")
 
 	cpus := fmt.Sprintf("%d", frankenphp.MaxThreads)
 
@@ -468,29 +462,21 @@ func TestWorkerMetrics(t *testing.T) {
 	# TYPE frankenphp_busy_threads gauge
 	frankenphp_busy_threads 2
 
-	# HELP frankenphp_testdata_index_php_busy_workers Number of busy PHP workers for this worker
-	# TYPE frankenphp_testdata_index_php_busy_workers gauge
-	frankenphp_testdata_index_php_busy_workers 0
+	# HELP frankenphp_busy_workers Number of busy PHP workers for this worker
+	# TYPE frankenphp_busy_workers gauge
+	frankenphp_busy_workers{worker="` + workerName + `"} 0
 
-	# HELP frankenphp_testdata_index_php_total_workers Total number of PHP workers for this worker
-	# TYPE frankenphp_testdata_index_php_total_workers gauge
-	frankenphp_testdata_index_php_total_workers 2
+	# HELP frankenphp_total_workers Total number of PHP workers for this worker
+	# TYPE frankenphp_total_workers gauge
+	frankenphp_total_workers{worker="` + workerName + `"} 2
 
-	# HELP frankenphp_testdata_index_php_worker_request_count
-	# TYPE frankenphp_testdata_index_php_worker_request_count counter
-	frankenphp_testdata_index_php_worker_request_count 10
+	# HELP frankenphp_worker_request_count
+	# TYPE frankenphp_worker_request_count counter
+	frankenphp_worker_request_count{worker="` + workerName + `"} 10
 
-	# HELP frankenphp_testdata_index_php_ready_workers Running workers that have successfully called frankenphp_handle_request at least once
-	# TYPE frankenphp_testdata_index_php_ready_workers gauge
-	frankenphp_testdata_index_php_ready_workers 2
-
-	# HELP frankenphp_testdata_index_php_worker_crashes Number of PHP worker crashes for this worker
-	# TYPE frankenphp_testdata_index_php_worker_crashes counter
-	frankenphp_testdata_index_php_worker_crashes 0
-
-	# HELP frankenphp_testdata_index_php_worker_restarts Number of PHP worker restarts for this worker
-	# TYPE frankenphp_testdata_index_php_worker_restarts counter
-	frankenphp_testdata_index_php_worker_restarts 0
+	# HELP frankenphp_ready_workers Running workers that have successfully called frankenphp_handle_request at least once
+	# TYPE frankenphp_ready_workers gauge
+	frankenphp_ready_workers{worker="` + workerName + `"} 2
 	`
 
 	ctx := caddy.ActiveContext()
@@ -500,15 +486,105 @@ func TestWorkerMetrics(t *testing.T) {
 			strings.NewReader(expectedMetrics),
 			"frankenphp_total_threads",
 			"frankenphp_busy_threads",
-			"frankenphp_testdata_index_php_busy_workers",
-			"frankenphp_testdata_index_php_total_workers",
-			"frankenphp_testdata_index_php_worker_request_count",
-			"frankenphp_testdata_index_php_worker_crashes",
-			"frankenphp_testdata_index_php_worker_restarts",
-			"frankenphp_testdata_index_php_ready_workers",
+			"frankenphp_busy_workers",
+			"frankenphp_total_workers",
+			"frankenphp_worker_request_count",
+			"frankenphp_ready_workers",
 		))
 }
 
+func TestNamedWorkerMetrics(t *testing.T) {
+	var wg sync.WaitGroup
+	tester := caddytest.NewTester(t)
+	tester.InitServer(`
+	{
+		skip_install_trust
+		admin localhost:2999
+		http_port `+testPort+`
+		https_port 9443
+
+		frankenphp {
+			worker {
+				name my_app
+				file ../testdata/index.php
+				num 2
+			}
+		}
+	}
+
+	localhost:`+testPort+` {
+		route {
+			php {
+				root ../testdata
+			}
+		}
+	}
+	`, "caddyfile")
+
+	// Make some requests
+	for i := 0; i < 10; i++ {
+		wg.Add(1)
+		go func(i int) {
+			tester.AssertGetResponse(fmt.Sprintf("http://localhost:"+testPort+"/index.php?i=%d", i), http.StatusOK, fmt.Sprintf("I am by birth a Genevese (%d)", i))
+			wg.Done()
+		}(i)
+	}
+	wg.Wait()
+
+	// Fetch metrics
+	resp, err := http.Get("http://localhost:2999/metrics")
+	require.NoError(t, err, "failed to fetch metrics")
+	defer resp.Body.Close()
+
+	// Read and parse metrics
+	metrics := new(bytes.Buffer)
+	_, err = metrics.ReadFrom(resp.Body)
+	require.NoError(t, err, "failed to read metrics")
+
+	cpus := fmt.Sprintf("%d", frankenphp.MaxThreads)
+
+	// Check metrics
+	expectedMetrics := `
+	# HELP frankenphp_total_threads Total number of PHP threads
+	# TYPE frankenphp_total_threads counter
+	frankenphp_total_threads ` + cpus + `
+
+	# HELP frankenphp_busy_threads Number of busy PHP threads
+	# TYPE frankenphp_busy_threads gauge
+	frankenphp_busy_threads 2
+
+	# HELP frankenphp_busy_workers Number of busy PHP workers for this worker
+        # TYPE frankenphp_busy_workers gauge
+        frankenphp_busy_workers{worker="my_app"} 0
+
+	# HELP frankenphp_total_workers Total number of PHP workers for this worker
+	# TYPE frankenphp_total_workers gauge
+	frankenphp_total_workers{worker="my_app"} 2
+
+	# HELP frankenphp_worker_request_count
+	# TYPE frankenphp_worker_request_count counter
+	frankenphp_worker_request_count{worker="my_app"} 10
+
+	# HELP frankenphp_ready_workers Running workers that have successfully called frankenphp_handle_request at least once
+	# TYPE frankenphp_ready_workers gauge
+	frankenphp_ready_workers{worker="my_app"} 2
+	`
+
+	ctx := caddy.ActiveContext()
+	require.NoError(t,
+		testutil.GatherAndCompare(
+			ctx.GetMetricsRegistry(),
+			strings.NewReader(expectedMetrics),
+			"frankenphp_total_threads",
+			"frankenphp_busy_threads",
+			"frankenphp_busy_workers",
+			"frankenphp_total_workers",
+			"frankenphp_worker_request_count",
+			"frankenphp_ready_workers",
+		),
+	)
+}
+
 func TestAutoWorkerConfig(t *testing.T) {
 	var wg sync.WaitGroup
 	tester := caddytest.NewTester(t)
@@ -533,6 +609,8 @@ func TestAutoWorkerConfig(t *testing.T) {
 	}
 	`, "caddyfile")
 
+	workerName, _ := fastabs.FastAbs("../testdata/index.php")
+
 	// Make some requests
 	for i := 0; i < 10; i++ {
 		wg.Add(1)
@@ -545,17 +623,13 @@ func TestAutoWorkerConfig(t *testing.T) {
 
 	// Fetch metrics
 	resp, err := http.Get("http://localhost:2999/metrics")
-	if err != nil {
-		t.Fatalf("failed to fetch metrics: %v", err)
-	}
+	require.NoError(t, err, "failed to fetch metrics")
 	defer resp.Body.Close()
 
 	// Read and parse metrics
 	metrics := new(bytes.Buffer)
 	_, err = metrics.ReadFrom(resp.Body)
-	if err != nil {
-		t.Fatalf("failed to read metrics: %v", err)
-	}
+	require.NoError(t, err, "failed to read metrics")
 
 	cpus := fmt.Sprintf("%d", frankenphp.MaxThreads)
 	workers := fmt.Sprintf("%d", frankenphp.MaxThreads-1)
@@ -570,29 +644,21 @@ func TestAutoWorkerConfig(t *testing.T) {
 	# TYPE frankenphp_busy_threads gauge
 	frankenphp_busy_threads ` + workers + `
 
-	# HELP frankenphp_testdata_index_php_busy_workers Number of busy PHP workers for this worker
-	# TYPE frankenphp_testdata_index_php_busy_workers gauge
-	frankenphp_testdata_index_php_busy_workers 0
+	# HELP frankenphp_busy_workers Number of busy PHP workers for this worker
+	# TYPE frankenphp_busy_workers gauge
+	frankenphp_busy_workers{worker="` + workerName + `"} 0
 
-	# HELP frankenphp_testdata_index_php_total_workers Total number of PHP workers for this worker
-	# TYPE frankenphp_testdata_index_php_total_workers gauge
-	frankenphp_testdata_index_php_total_workers ` + workers + `
+	# HELP frankenphp_total_workers Total number of PHP workers for this worker
+	# TYPE frankenphp_total_workers gauge
+	frankenphp_total_workers{worker="` + workerName + `"} ` + workers + `
 
-	# HELP frankenphp_testdata_index_php_worker_request_count
-	# TYPE frankenphp_testdata_index_php_worker_request_count counter
-	frankenphp_testdata_index_php_worker_request_count 10
+	# HELP frankenphp_worker_request_count
+	# TYPE frankenphp_worker_request_count counter
+	frankenphp_worker_request_count{worker="` + workerName + `"} 10
 
-	# HELP frankenphp_testdata_index_php_ready_workers Running workers that have successfully called frankenphp_handle_request at least once
-	# TYPE frankenphp_testdata_index_php_ready_workers gauge
-	frankenphp_testdata_index_php_ready_workers ` + workers + `
-
-	# HELP frankenphp_testdata_index_php_worker_crashes Number of PHP worker crashes for this worker
-	# TYPE frankenphp_testdata_index_php_worker_crashes counter
-	frankenphp_testdata_index_php_worker_crashes 0
-
-	# HELP frankenphp_testdata_index_php_worker_restarts Number of PHP worker restarts for this worker
-	# TYPE frankenphp_testdata_index_php_worker_restarts counter
-	frankenphp_testdata_index_php_worker_restarts 0
+	# HELP frankenphp_ready_workers Running workers that have successfully called frankenphp_handle_request at least once
+	# TYPE frankenphp_ready_workers gauge
+	frankenphp_ready_workers{worker="` + workerName + `"} ` + workers + `
 	`
 
 	ctx := caddy.ActiveContext()
@@ -602,12 +668,10 @@ func TestAutoWorkerConfig(t *testing.T) {
 			strings.NewReader(expectedMetrics),
 			"frankenphp_total_threads",
 			"frankenphp_busy_threads",
-			"frankenphp_testdata_index_php_busy_workers",
-			"frankenphp_testdata_index_php_total_workers",
-			"frankenphp_testdata_index_php_worker_request_count",
-			"frankenphp_testdata_index_php_worker_crashes",
-			"frankenphp_testdata_index_php_worker_restarts",
-			"frankenphp_testdata_index_php_ready_workers",
+			"frankenphp_busy_workers",
+			"frankenphp_total_workers",
+			"frankenphp_worker_request_count",
+			"frankenphp_ready_workers",
 		))
 }
 
@@ -799,3 +863,213 @@ func getStatusCode(url string, t *testing.T) int {
 	defer resp.Body.Close()
 	return resp.StatusCode
 }
+
+func TestMultiWorkersMetrics(t *testing.T) {
+	var wg sync.WaitGroup
+	tester := caddytest.NewTester(t)
+	tester.InitServer(`
+	{
+		skip_install_trust
+		admin localhost:2999
+		http_port `+testPort+`
+		https_port 9443
+
+		frankenphp {
+			worker {
+				name service1
+				file ../testdata/index.php
+				num 2
+			}
+			worker {
+				name service2
+				file ../testdata/ini.php
+				num 3
+			}
+		}
+	}
+
+	localhost:`+testPort+` {
+		route {
+			php {
+				root ../testdata
+			}
+		}
+	}
+
+	example.com:`+testPort+` {
+		route {
+			php {
+				root ../testdata
+			}
+		}
+	}
+	`, "caddyfile")
+
+	// Make some requests
+	for i := 0; i < 10; i++ {
+		wg.Add(1)
+		go func(i int) {
+			tester.AssertGetResponse(fmt.Sprintf("http://localhost:"+testPort+"/index.php?i=%d", i), http.StatusOK, fmt.Sprintf("I am by birth a Genevese (%d)", i))
+			wg.Done()
+		}(i)
+	}
+	wg.Wait()
+
+	// Fetch metrics
+	resp, err := http.Get("http://localhost:2999/metrics")
+	require.NoError(t, err, "failed to fetch metrics")
+	defer resp.Body.Close()
+
+	// Read and parse metrics
+	metrics := new(bytes.Buffer)
+	_, err = metrics.ReadFrom(resp.Body)
+	require.NoError(t, err, "failed to read metrics")
+
+	cpus := fmt.Sprintf("%d", frankenphp.MaxThreads)
+
+	// Check metrics
+	expectedMetrics := `
+	# HELP frankenphp_total_threads Total number of PHP threads
+	# TYPE frankenphp_total_threads counter
+	frankenphp_total_threads ` + cpus + `
+
+	# HELP frankenphp_busy_threads Number of busy PHP threads
+	# TYPE frankenphp_busy_threads gauge
+	frankenphp_busy_threads 5
+
+	# HELP frankenphp_busy_workers Number of busy PHP workers for this worker
+	# TYPE frankenphp_busy_workers gauge
+	frankenphp_busy_workers{worker="service1"} 0
+
+	# HELP frankenphp_total_workers Total number of PHP workers for this worker
+	# TYPE frankenphp_total_workers gauge
+	frankenphp_total_workers{worker="service1"} 2
+	frankenphp_total_workers{worker="service2"} 3
+
+	# HELP frankenphp_worker_request_count
+	# TYPE frankenphp_worker_request_count counter
+	frankenphp_worker_request_count{worker="service1"} 10
+
+	# HELP frankenphp_ready_workers Running workers that have successfully called frankenphp_handle_request at least once
+	# TYPE frankenphp_ready_workers gauge
+	frankenphp_ready_workers{worker="service1"} 2
+	frankenphp_ready_workers{worker="service2"} 3
+	`
+
+	ctx := caddy.ActiveContext()
+	require.NoError(t,
+		testutil.GatherAndCompare(
+			ctx.GetMetricsRegistry(),
+			strings.NewReader(expectedMetrics),
+			"frankenphp_total_threads",
+			"frankenphp_busy_threads",
+			"frankenphp_busy_workers",
+			"frankenphp_total_workers",
+			"frankenphp_worker_request_count",
+			"frankenphp_ready_workers",
+		))
+}
+
+func TestMultiWorkersMetricsWithDuplicateName(t *testing.T) {
+	var wg sync.WaitGroup
+	tester := caddytest.NewTester(t)
+	tester.InitServer(`
+	{
+		skip_install_trust
+		admin localhost:2999
+		http_port `+testPort+`
+		https_port 9443
+
+		frankenphp {
+			worker {
+				name service1
+				file ../testdata/index.php
+				num 2
+			}
+			worker {
+				name service1
+				file ../testdata/ini.php
+				num 3
+			}
+		}
+	}
+
+	localhost:`+testPort+` {
+		route {
+			php {
+				root ../testdata
+			}
+		}
+	}
+
+	example.com:`+testPort+` {
+		route {
+			php {
+				root ../testdata
+			}
+		}
+	}
+	`, "caddyfile")
+
+	// Make some requests
+	for i := 0; i < 10; i++ {
+		wg.Add(1)
+		go func(i int) {
+			tester.AssertGetResponse(fmt.Sprintf("http://localhost:"+testPort+"/index.php?i=%d", i), http.StatusOK, fmt.Sprintf("I am by birth a Genevese (%d)", i))
+			wg.Done()
+		}(i)
+	}
+	wg.Wait()
+
+	// Fetch metrics
+	resp, err := http.Get("http://localhost:2999/metrics")
+	require.NoError(t, err, "failed to fetch metrics")
+	defer resp.Body.Close()
+
+	// Read and parse metrics
+	metrics := new(bytes.Buffer)
+	_, err = metrics.ReadFrom(resp.Body)
+	require.NoError(t, err, "failed to read metrics")
+
+	cpus := fmt.Sprintf("%d", frankenphp.MaxThreads)
+
+	// Check metrics
+	expectedMetrics := `
+	# HELP frankenphp_total_threads Total number of PHP threads
+	# TYPE frankenphp_total_threads counter
+	frankenphp_total_threads ` + cpus + `
+
+	# HELP frankenphp_busy_threads Number of busy PHP threads
+	# TYPE frankenphp_busy_threads gauge
+	frankenphp_busy_threads 5
+
+	# HELP frankenphp_busy_workers Number of busy PHP workers for this worker
+	# TYPE frankenphp_busy_workers gauge
+	frankenphp_busy_workers{worker="service1"} 0
+
+	# HELP frankenphp_total_workers Total number of PHP workers for this worker
+	# TYPE frankenphp_total_workers gauge
+	frankenphp_total_workers{worker="service1"} 5
+
+	# HELP frankenphp_worker_request_count
+	# TYPE frankenphp_worker_request_count counter
+	frankenphp_worker_request_count{worker="service1"} 10
+
+	# HELP frankenphp_ready_workers Running workers that have successfully called frankenphp_handle_request at least once
+	# TYPE frankenphp_ready_workers gauge
+	frankenphp_ready_workers{worker="service1"} 5
+	`
+
+	ctx := caddy.ActiveContext()
+	require.NoError(t,
+		testutil.GatherAndCompare(
+			ctx.GetMetricsRegistry(),
+			strings.NewReader(expectedMetrics),
+			"frankenphp_total_threads",
+			"frankenphp_busy_threads",
+			"frankenphp_busy_workers",
+			"frankenphp_total_workers",
+			"frankenphp_worker_request_count",
+			"frankenphp_ready_workers",
+		))
+}

docs/config.md

@@ -58,6 +58,7 @@ Optionally, the number of threads to create and [worker scripts](worker.md) to s
 			num <num> # Sets the number of PHP threads to start, defaults to 2x the number of available CPUs.
 			env <key> <value> # Sets an extra environment variable to the given value. Can be specified more than once for multiple environment variables.
 			watch <path> # Sets the path to watch for file changes. Can be specified more than once for multiple paths.
+			name <name> # Sets the name of the worker, used in logs and metrics. Default: absolute path of worker file
 		}
 	}
 }

docs/metrics.md

@@ -2,14 +2,16 @@
 
 When [Caddy metrics](https://caddyserver.com/docs/metrics) are enabled, FrankenPHP exposes the following metrics:
 
-* `frankenphp_[worker]_total_workers`: The total number of workers.
-* `frankenphp_[worker]_busy_workers`: The number of workers currently processing a request.
-* `frankenphp_[worker]_worker_request_time`: The time spent processing requests by all workers.
-* `frankenphp_[worker]_worker_request_count`: The number of requests processed by all workers.
-* `frankenphp_[worker]_ready_workers`: The number of workers that have called `frankenphp_handle_request` at least once.
-* `frankenphp_[worker]_worker_crashes`: The number of times a worker has unexpectedly terminated.
-* `frankenphp_[worker]_worker_restarts`: The number of times a worker has been deliberately restarted.
 * `frankenphp_total_threads`: The total number of PHP threads.
 * `frankenphp_busy_threads`: The number of PHP threads currently processing a request (running workers always consume a thread).
+* `frankenphp_queue_depth`: The number of regular queued requests
+* `frankenphp_total_workers{worker="[worker_name]"}`: The total number of workers.
+* `frankenphp_busy_workers{worker="[worker_name]"}`: The number of workers currently processing a request.
+* `frankenphp_worker_request_time{worker="[worker_name]"}`: The time spent processing requests by all workers.
+* `frankenphp_worker_request_count{worker="[worker_name]"}`: The number of requests processed by all workers.
+* `frankenphp_ready_workers{worker="[worker_name]"}`: The number of workers that have called `frankenphp_handle_request` at least once.
+* `frankenphp_worker_crashes{worker="[worker_name]"}`: The number of times a worker has unexpectedly terminated.
+* `frankenphp_worker_restarts{worker="[worker_name]"}`: The number of times a worker has been deliberately restarted.
+* `frankenphp_worker_queue_depth{worker="[worker_name]"}`: The number of queued requests.
 
-For worker metrics, the `[worker]` placeholder is replaced by the worker script path in the Caddyfile.
+For worker metrics, the `[worker_name]` placeholder is replaced by the worker name in the Caddyfile, otherwise absolute path of worker file will be used.

frankenphp.go

@@ -160,7 +160,7 @@ func calculateMaxThreads(opt *opt) (int, int, int, error) {
 			// https://github.com/dunglas/frankenphp/issues/126
 			opt.workers[i].num = maxProcs
 		}
-		metrics.TotalWorkers(w.fileName, w.num)
+		metrics.TotalWorkers(w.name, w.num)
 
 		numWorkers += opt.workers[i].num
 	}

frankenphp_test.go

@@ -9,7 +9,6 @@ import (
 	"context"
 	"errors"
 	"fmt"
-	"github.com/dunglas/frankenphp/internal/fastabs"
 	"io"
 	"log"
 	"mime/multipart"
@@ -28,6 +27,7 @@ import (
 	"testing"
 
 	"github.com/dunglas/frankenphp"
+	"github.com/dunglas/frankenphp/internal/fastabs"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 	"go.uber.org/zap"
@@ -65,7 +65,7 @@ func runTest(t *testing.T, test func(func(http.ResponseWriter, *http.Request), *
 
 	initOpts := []frankenphp.Option{frankenphp.WithLogger(opts.logger)}
 	if opts.workerScript != "" {
-		initOpts = append(initOpts, frankenphp.WithWorkers(testDataDir+opts.workerScript, opts.nbWorkers, opts.env, opts.watch))
+		initOpts = append(initOpts, frankenphp.WithWorkers("workerName", testDataDir+opts.workerScript, opts.nbWorkers, opts.env, opts.watch))
 	}
 	initOpts = append(initOpts, opts.initOpts...)
 	if opts.phpIni != nil {

go.mod

@@ -20,6 +20,7 @@ require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/dolthub/maphash v0.1.0 // indirect
 	github.com/gammazero/deque v1.0.0 // indirect
+	github.com/kylelemons/godebug v1.1.0 // indirect
 	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/prometheus/client_model v0.6.1 // indirect

go.sum

@@ -16,6 +16,8 @@ github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
 github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=
 github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
 github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
+github.com/kylelemons/godebug v1.1.0 h1:RPNrshWIDI6G2gRW9EHilWtl7Z6Sb1BR0xunSBf0SNc=
+github.com/kylelemons/godebug v1.1.0/go.mod h1:9/0rRGxNHcop5bhtWyNeEfOS8JIWk580+fNqagV/RAw=
 github.com/maypok86/otter v1.2.4 h1:HhW1Pq6VdJkmWwcZZq19BlEQkHtI8xgsQzBVXJU0nfc=
 github.com/maypok86/otter v1.2.4/go.mod h1:mKLfoI7v1HOmQMwFgX4QkRk23mX6ge3RDvjdHOWG4R4=
 github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 h1:C3w9PqII01/Oq1c1nUAm88MOHcQC9l5mIlSMApZMrHA=

metrics.go

@@ -2,18 +2,12 @@ package frankenphp
 
 import (
 	"errors"
-	"regexp"
 	"sync"
 	"time"
 
-	"github.com/dunglas/frankenphp/internal/fastabs"
-
 	"github.com/prometheus/client_golang/prometheus"
 )
 
-var metricsNameRegex = regexp.MustCompile(`\W+`)
-var metricsNameFixRegex = regexp.MustCompile(`^_+|_+$`)
-
 const (
 	StopReasonCrash = iota
 	StopReasonRestart
@@ -91,172 +85,163 @@ type PrometheusMetrics struct {
 	registry           prometheus.Registerer
 	totalThreads       prometheus.Counter
 	busyThreads        prometheus.Gauge
-	totalWorkers       map[string]prometheus.Gauge
-	busyWorkers        map[string]prometheus.Gauge
-	readyWorkers       map[string]prometheus.Gauge
-	workerCrashes      map[string]prometheus.Counter
-	workerRestarts     map[string]prometheus.Counter
-	workerRequestTime  map[string]prometheus.Counter
-	workerRequestCount map[string]prometheus.Counter
-	workerQueueDepth   map[string]prometheus.Gauge
+	totalWorkers       *prometheus.GaugeVec
+	busyWorkers        *prometheus.GaugeVec
+	readyWorkers       *prometheus.GaugeVec
+	workerCrashes      *prometheus.CounterVec
+	workerRestarts     *prometheus.CounterVec
+	workerRequestTime  *prometheus.CounterVec
+	workerRequestCount *prometheus.CounterVec
+	workerQueueDepth   *prometheus.GaugeVec
 	queueDepth         prometheus.Gauge
 	mu                 sync.Mutex
 }
 
+func (m *PrometheusMetrics) getLabels(name string) prometheus.Labels {
+	return prometheus.Labels{"worker": name}
+}
+
 func (m *PrometheusMetrics) StartWorker(name string) {
 	m.busyThreads.Inc()
 
 	// tests do not register workers before starting them
-	if _, ok := m.totalWorkers[name]; !ok {
+	if m.totalWorkers == nil {
 		return
 	}
-	m.totalWorkers[name].Inc()
+
+	m.totalWorkers.With(m.getLabels(name)).Inc()
 }
 
 func (m *PrometheusMetrics) ReadyWorker(name string) {
-	if _, ok := m.totalWorkers[name]; !ok {
+	if m.totalWorkers == nil {
 		return
 	}
 
-	m.readyWorkers[name].Inc()
+	m.readyWorkers.With(m.getLabels(name)).Inc()
 }
 
 func (m *PrometheusMetrics) StopWorker(name string, reason StopReason) {
 	m.busyThreads.Dec()
 
 	// tests do not register workers before starting them
-	if _, ok := m.totalWorkers[name]; !ok {
+	if m.totalWorkers == nil {
 		return
 	}
-	m.totalWorkers[name].Dec()
-	m.readyWorkers[name].Dec()
+
+	metricLabels := m.getLabels(name)
+	m.totalWorkers.With(metricLabels).Dec()
+	m.readyWorkers.With(metricLabels).Dec()
 
 	if reason == StopReasonCrash {
-		m.workerCrashes[name].Inc()
+		m.workerCrashes.With(metricLabels).Inc()
 	} else if reason == StopReasonRestart {
-		m.workerRestarts[name].Inc()
-	} else if reason == StopReasonShutdown {
-		m.totalWorkers[name].Dec()
+		m.workerRestarts.With(metricLabels).Inc()
 	}
 }
 
-func (m *PrometheusMetrics) getIdentity(name string) (string, error) {
-	actualName, err := fastabs.FastAbs(name)
-	if err != nil {
-		return name, err
-	}
-
-	return actualName, nil
-}
-
-func (m *PrometheusMetrics) TotalWorkers(name string, _ int) {
+func (m *PrometheusMetrics) TotalWorkers(string, int) {
 	m.mu.Lock()
 	defer m.mu.Unlock()
 
-	identity, err := m.getIdentity(name)
-	if err != nil {
-		// do not create metrics, let error propagate when worker is started
-		return
-	}
+	const ns, sub = "frankenphp", "worker"
+	basicLabels := []string{"worker"}
 
-	subsystem := getWorkerNameForMetrics(name)
-
-	if _, ok := m.totalWorkers[identity]; !ok {
-		m.totalWorkers[identity] = prometheus.NewGauge(prometheus.GaugeOpts{
-			Namespace: "frankenphp",
-			Subsystem: subsystem,
+	if m.totalWorkers == nil {
+		m.totalWorkers = prometheus.NewGaugeVec(prometheus.GaugeOpts{
+			Namespace: ns,
 			Name:      "total_workers",
 			Help:      "Total number of PHP workers for this worker",
-		})
-		if err := m.registry.Register(m.totalWorkers[identity]); err != nil &&
+		}, basicLabels)
+		if err := m.registry.Register(m.totalWorkers); err != nil &&
 			!errors.As(err, &prometheus.AlreadyRegisteredError{}) {
 			panic(err)
 		}
 	}
 
-	if _, ok := m.workerCrashes[identity]; !ok {
-		m.workerCrashes[identity] = prometheus.NewCounter(prometheus.CounterOpts{
-			Namespace: "frankenphp",
-			Subsystem: subsystem,
-			Name:      "worker_crashes",
-			Help:      "Number of PHP worker crashes for this worker",
-		})
-		if err := m.registry.Register(m.workerCrashes[identity]); err != nil &&
-			!errors.As(err, &prometheus.AlreadyRegisteredError{}) {
-			panic(err)
-		}
-	}
-
-	if _, ok := m.workerRestarts[identity]; !ok {
-		m.workerRestarts[identity] = prometheus.NewCounter(prometheus.CounterOpts{
-			Namespace: "frankenphp",
-			Subsystem: subsystem,
-			Name:      "worker_restarts",
-			Help:      "Number of PHP worker restarts for this worker",
-		})
-		if err := m.registry.Register(m.workerRestarts[identity]); err != nil &&
-			!errors.As(err, &prometheus.AlreadyRegisteredError{}) {
-			panic(err)
-		}
-	}
-
-	if _, ok := m.readyWorkers[identity]; !ok {
-		m.readyWorkers[identity] = prometheus.NewGauge(prometheus.GaugeOpts{
-			Namespace: "frankenphp",
-			Subsystem: subsystem,
+	if m.readyWorkers == nil {
+		m.readyWorkers = prometheus.NewGaugeVec(prometheus.GaugeOpts{
+			Namespace: ns,
 			Name:      "ready_workers",
 			Help:      "Running workers that have successfully called frankenphp_handle_request at least once",
-		})
-		if err := m.registry.Register(m.readyWorkers[identity]); err != nil &&
+		}, basicLabels)
+		if err := m.registry.Register(m.readyWorkers); err != nil &&
 			!errors.As(err, &prometheus.AlreadyRegisteredError{}) {
 			panic(err)
 		}
 	}
 
-	if _, ok := m.busyWorkers[identity]; !ok {
-		m.busyWorkers[identity] = prometheus.NewGauge(prometheus.GaugeOpts{
-			Namespace: "frankenphp",
-			Subsystem: subsystem,
+	if m.busyWorkers == nil {
+		m.busyWorkers = prometheus.NewGaugeVec(prometheus.GaugeOpts{
+			Namespace: ns,
 			Name:      "busy_workers",
 			Help:      "Number of busy PHP workers for this worker",
-		})
-		if err := m.registry.Register(m.busyWorkers[identity]); err != nil &&
+		}, basicLabels)
+		if err := m.registry.Register(m.busyWorkers); err != nil &&
 			!errors.As(err, &prometheus.AlreadyRegisteredError{}) {
 			panic(err)
 		}
 	}
 
-	if _, ok := m.workerRequestTime[identity]; !ok {
-		m.workerRequestTime[identity] = prometheus.NewCounter(prometheus.CounterOpts{
-			Namespace: "frankenphp",
-			Subsystem: subsystem,
-			Name:      "worker_request_time",
-		})
-		if err := m.registry.Register(m.workerRequestTime[identity]); err != nil &&
+	if m.workerCrashes == nil {
+		m.workerCrashes = prometheus.NewCounterVec(prometheus.CounterOpts{
+			Namespace: ns,
+			Subsystem: sub,
+			Name:      "crashes",
+			Help:      "Number of PHP worker crashes for this worker",
+		}, basicLabels)
+		if err := m.registry.Register(m.workerCrashes); err != nil &&
 			!errors.As(err, &prometheus.AlreadyRegisteredError{}) {
 			panic(err)
 		}
 	}
 
-	if _, ok := m.workerRequestCount[identity]; !ok {
-		m.workerRequestCount[identity] = prometheus.NewCounter(prometheus.CounterOpts{
-			Namespace: "frankenphp",
-			Subsystem: subsystem,
-			Name:      "worker_request_count",
-		})
-		if err := m.registry.Register(m.workerRequestCount[identity]); err != nil &&
+	if m.workerRestarts == nil {
+		m.workerRestarts = prometheus.NewCounterVec(prometheus.CounterOpts{
+			Namespace: ns,
+			Subsystem: sub,
+			Name:      "restarts",
+			Help:      "Number of PHP worker restarts for this worker",
+		}, basicLabels)
+		if err := m.registry.Register(m.workerRestarts); err != nil &&
 			!errors.As(err, &prometheus.AlreadyRegisteredError{}) {
 			panic(err)
 		}
 	}
 
-	if _, ok := m.workerQueueDepth[identity]; !ok {
-		m.workerQueueDepth[identity] = prometheus.NewGauge(prometheus.GaugeOpts{
+	if m.workerRequestTime == nil {
+		m.workerRequestTime = prometheus.NewCounterVec(prometheus.CounterOpts{
+			Namespace: ns,
+			Subsystem: sub,
+			Name:      "request_time",
+		}, basicLabels)
+		if err := m.registry.Register(m.workerRequestTime); err != nil &&
+			!errors.As(err, &prometheus.AlreadyRegisteredError{}) {
+			panic(err)
+		}
+	}
+
+	if m.workerRequestCount == nil {
+		m.workerRequestCount = prometheus.NewCounterVec(prometheus.CounterOpts{
+			Namespace: ns,
+			Subsystem: sub,
+			Name:      "request_count",
+		}, basicLabels)
+		if err := m.registry.Register(m.workerRequestCount); err != nil &&
+			!errors.As(err, &prometheus.AlreadyRegisteredError{}) {
+			panic(err)
+		}
+	}
+
+	if m.workerQueueDepth == nil {
+		m.workerQueueDepth = prometheus.NewGaugeVec(prometheus.GaugeOpts{
 			Namespace: "frankenphp",
-			Subsystem: subsystem,
-			Name:      "worker_queue_depth",
-		})
-		m.registry.MustRegister(m.workerQueueDepth[identity])
+			Subsystem: sub,
+			Name:      "queue_depth",
+		}, basicLabels)
+		if err := m.registry.Register(m.workerQueueDepth); err != nil &&
+			!errors.As(err, &prometheus.AlreadyRegisteredError{}) {
+			panic(err)
+		}
 	}
 }
 
@@ -273,34 +258,35 @@ func (m *PrometheusMetrics) StopRequest() {
 }
 
 func (m *PrometheusMetrics) StopWorkerRequest(name string, duration time.Duration) {
-	if _, ok := m.workerRequestTime[name]; !ok {
+	if m.workerRequestTime == nil {
 		return
 	}
 
-	m.workerRequestCount[name].Inc()
-	m.busyWorkers[name].Dec()
-	m.workerRequestTime[name].Add(duration.Seconds())
+	metricLabels := m.getLabels(name)
+	m.workerRequestCount.With(metricLabels).Inc()
+	m.busyWorkers.With(metricLabels).Dec()
+	m.workerRequestTime.With(metricLabels).Add(duration.Seconds())
 }
 
 func (m *PrometheusMetrics) StartWorkerRequest(name string) {
-	if _, ok := m.busyWorkers[name]; !ok {
+	if m.busyWorkers == nil {
 		return
 	}
-	m.busyWorkers[name].Inc()
+	m.busyWorkers.With(m.getLabels(name)).Inc()
 }
 
 func (m *PrometheusMetrics) QueuedWorkerRequest(name string) {
-	if _, ok := m.workerQueueDepth[name]; !ok {
+	if m.workerQueueDepth == nil {
 		return
 	}
-	m.workerQueueDepth[name].Inc()
+	m.workerQueueDepth.With(m.getLabels(name)).Inc()
 }
 
 func (m *PrometheusMetrics) DequeuedWorkerRequest(name string) {
-	if _, ok := m.workerQueueDepth[name]; !ok {
+	if m.workerQueueDepth == nil {
 		return
 	}
-	m.workerQueueDepth[name].Dec()
+	m.workerQueueDepth.With(m.getLabels(name)).Dec()
 }
 
 func (m *PrometheusMetrics) QueuedRequest() {
@@ -316,36 +302,44 @@ func (m *PrometheusMetrics) Shutdown() {
 	m.registry.Unregister(m.busyThreads)
 	m.registry.Unregister(m.queueDepth)
 
-	for _, g := range m.totalWorkers {
-		m.registry.Unregister(g)
+	if m.totalWorkers != nil {
+		m.registry.Unregister(m.totalWorkers)
+		m.totalWorkers = nil
 	}
 
-	for _, g := range m.busyWorkers {
-		m.registry.Unregister(g)
+	if m.busyWorkers != nil {
+		m.registry.Unregister(m.busyWorkers)
+		m.busyWorkers = nil
 	}
 
-	for _, c := range m.workerRequestTime {
-		m.registry.Unregister(c)
+	if m.workerRequestTime != nil {
+		m.registry.Unregister(m.workerRequestTime)
+		m.workerRequestTime = nil
 	}
 
-	for _, c := range m.workerRequestCount {
-		m.registry.Unregister(c)
+	if m.workerRequestCount != nil {
+		m.registry.Unregister(m.workerRequestCount)
+		m.workerRequestCount = nil
 	}
 
-	for _, c := range m.workerCrashes {
-		m.registry.Unregister(c)
+	if m.workerCrashes != nil {
+		m.registry.Unregister(m.workerCrashes)
+		m.workerCrashes = nil
 	}
 
-	for _, c := range m.workerRestarts {
-		m.registry.Unregister(c)
+	if m.workerRestarts != nil {
+		m.registry.Unregister(m.workerRestarts)
+		m.workerRestarts = nil
 	}
 
-	for _, g := range m.readyWorkers {
-		m.registry.Unregister(g)
+	if m.readyWorkers != nil {
+		m.registry.Unregister(m.readyWorkers)
+		m.readyWorkers = nil
 	}
 
-	for _, g := range m.workerQueueDepth {
-		m.registry.Unregister(g)
+	if m.workerQueueDepth != nil {
+		m.registry.Unregister(m.workerQueueDepth)
+		m.workerQueueDepth = nil
 	}
 
 	m.totalThreads = prometheus.NewCounter(prometheus.CounterOpts{
@@ -356,14 +350,6 @@ func (m *PrometheusMetrics) Shutdown() {
 		Name: "frankenphp_busy_threads",
 		Help: "Number of busy PHP threads",
 	})
-	m.totalWorkers = map[string]prometheus.Gauge{}
-	m.busyWorkers = map[string]prometheus.Gauge{}
-	m.workerRequestTime = map[string]prometheus.Counter{}
-	m.workerRequestCount = map[string]prometheus.Counter{}
-	m.workerRestarts = map[string]prometheus.Counter{}
-	m.workerCrashes = map[string]prometheus.Counter{}
-	m.readyWorkers = map[string]prometheus.Gauge{}
-	m.workerQueueDepth = map[string]prometheus.Gauge{}
 	m.queueDepth = prometheus.NewGauge(prometheus.GaugeOpts{
 		Name: "frankenphp_queue_depth",
 		Help: "Number of regular queued requests",
@@ -385,13 +371,6 @@ func (m *PrometheusMetrics) Shutdown() {
 	}
 }
 
-func getWorkerNameForMetrics(name string) string {
-	name = metricsNameRegex.ReplaceAllString(name, "_")
-	name = metricsNameFixRegex.ReplaceAllString(name, "")
-
-	return name
-}
-
 func NewPrometheusMetrics(registry prometheus.Registerer) *PrometheusMetrics {
 	if registry == nil {
 		registry = prometheus.NewRegistry()
@@ -407,18 +386,18 @@ func NewPrometheusMetrics(registry prometheus.Registerer) *PrometheusMetrics {
 			Name: "frankenphp_busy_threads",
 			Help: "Number of busy PHP threads",
 		}),
-		totalWorkers:       map[string]prometheus.Gauge{},
-		busyWorkers:        map[string]prometheus.Gauge{},
-		workerRequestTime:  map[string]prometheus.Counter{},
-		workerRequestCount: map[string]prometheus.Counter{},
-		workerRestarts:     map[string]prometheus.Counter{},
-		workerCrashes:      map[string]prometheus.Counter{},
-		readyWorkers:       map[string]prometheus.Gauge{},
-		workerQueueDepth:   map[string]prometheus.Gauge{},
 		queueDepth: prometheus.NewGauge(prometheus.GaugeOpts{
 			Name: "frankenphp_queue_depth",
 			Help: "Number of regular queued requests",
 		}),
+		totalWorkers:       nil,
+		busyWorkers:        nil,
+		workerRequestTime:  nil,
+		workerRequestCount: nil,
+		workerRestarts:     nil,
+		workerCrashes:      nil,
+		readyWorkers:       nil,
+		workerQueueDepth:   nil,
 	}
 
 	if err := m.registry.Register(m.totalThreads); err != nil &&

metrics_test.go

@@ -1,47 +1,22 @@
 package frankenphp
 
 import (
-	"github.com/prometheus/client_golang/prometheus"
-	"github.com/stretchr/testify/require"
+	"strings"
 	"sync"
 	"testing"
 	"time"
 
-	"github.com/stretchr/testify/assert"
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/testutil"
+	"github.com/stretchr/testify/require"
 )
 
-func TestGetWorkerNameForMetrics(t *testing.T) {
-	tests := []struct {
-		input    string
-		expected string
-	}{
-		{"worker-1", "worker_1"},
-		{"worker@name", "worker_name"},
-		{"worker name", "worker_name"},
-		{"worker/name", "worker_name"},
-		{"worker.name", "worker_name"},
-		{"////worker////name...//worker", "worker_name_worker"},
-	}
-
-	for _, test := range tests {
-		result := getWorkerNameForMetrics(test.input)
-		assert.Equal(t, test.expected, result)
-	}
-}
-
 func createPrometheusMetrics() *PrometheusMetrics {
 	return &PrometheusMetrics{
 		registry:     prometheus.NewRegistry(),
-		totalThreads:       prometheus.NewCounter(prometheus.CounterOpts{Name: "total_threads"}),
-		busyThreads:        prometheus.NewGauge(prometheus.GaugeOpts{Name: "busy_threads"}),
-		totalWorkers:       make(map[string]prometheus.Gauge),
-		busyWorkers:        make(map[string]prometheus.Gauge),
-		workerRequestTime:  make(map[string]prometheus.Counter),
-		workerRequestCount: make(map[string]prometheus.Counter),
-		workerCrashes:      make(map[string]prometheus.Counter),
-		workerRestarts:     make(map[string]prometheus.Counter),
-		workerQueueDepth:   make(map[string]prometheus.Gauge),
-		readyWorkers:       make(map[string]prometheus.Gauge),
+		totalThreads: prometheus.NewCounter(prometheus.CounterOpts{Name: "frankenphp_total_threads"}),
+		busyThreads:  prometheus.NewGauge(prometheus.GaugeOpts{Name: "frankenphp_busy_threads"}),
+		queueDepth:   prometheus.NewGauge(prometheus.GaugeOpts{Name: "frankenphp_queue_depth"}),
 		mu:           sync.Mutex{},
 	}
 }
@@ -49,38 +24,172 @@ func createPrometheusMetrics() *PrometheusMetrics {
 func TestPrometheusMetrics_TotalWorkers(t *testing.T) {
 	m := createPrometheusMetrics()
 
-	tests := []struct {
-		name   string
-		worker string
-		num    int
-	}{
-		{"SetWorkers", "test_worker", 5},
-	}
+	require.Nil(t, m.totalWorkers)
+	require.Nil(t, m.busyWorkers)
+	require.Nil(t, m.readyWorkers)
+	require.Nil(t, m.workerCrashes)
+	require.Nil(t, m.workerRestarts)
+	require.Nil(t, m.workerRequestTime)
+	require.Nil(t, m.workerRequestCount)
 
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			m.TotalWorkers(tt.worker, tt.num)
-			actualName, _ := m.getIdentity(tt.worker)
-			_, ok := m.totalWorkers[actualName]
-			require.True(t, ok)
-		})
-	}
+	m.TotalWorkers("test_worker", 2)
+
+	require.NotNil(t, m.totalWorkers)
+	require.NotNil(t, m.busyWorkers)
+	require.NotNil(t, m.readyWorkers)
+	require.NotNil(t, m.workerCrashes)
+	require.NotNil(t, m.workerRestarts)
+	require.NotNil(t, m.workerRequestTime)
+	require.NotNil(t, m.workerRequestCount)
 }
 
 func TestPrometheusMetrics_StopWorkerRequest(t *testing.T) {
 	m := createPrometheusMetrics()
+	m.TotalWorkers("test_worker", 2)
 	m.StopWorkerRequest("test_worker", 2*time.Second)
 
-	name := "test_worker"
-	_, ok := m.workerRequestTime[name]
-	require.False(t, ok)
+	inputs := []struct {
+		name     string
+		c        prometheus.Collector
+		metadata string
+		expect   string
+	}{
+		{
+			name: "Testing WorkerRequestCount",
+			c:    m.workerRequestCount,
+			metadata: `
+				# HELP frankenphp_worker_request_count
+				# TYPE frankenphp_worker_request_count counter
+			`,
+			expect: `
+				frankenphp_worker_request_count{worker="test_worker"} 1
+			`,
+		},
+		{
+			name: "Testing BusyWorkers",
+			c:    m.busyWorkers,
+			metadata: `
+				# HELP frankenphp_busy_workers Number of busy PHP workers for this worker
+				# TYPE frankenphp_busy_workers gauge
+			`,
+			expect: `
+				frankenphp_busy_workers{worker="test_worker"} -1
+			`,
+		},
+		{
+			name: "Testing WorkerRequestTime",
+			c:    m.workerRequestTime,
+			metadata: `
+				# HELP frankenphp_worker_request_time
+				# TYPE frankenphp_worker_request_time counter
+			`,
+			expect: `
+				frankenphp_worker_request_time{worker="test_worker"} 2
+			`,
+		},
+	}
+
+	for _, input := range inputs {
+		t.Run(input.name, func(t *testing.T) {
+			require.NoError(t, testutil.CollectAndCompare(input.c, strings.NewReader(input.metadata+input.expect)))
+		})
+
+	}
 }
 
 func TestPrometheusMetrics_StartWorkerRequest(t *testing.T) {
 	m := createPrometheusMetrics()
+	m.TotalWorkers("test_worker", 2)
 	m.StartWorkerRequest("test_worker")
 
-	name := "test_worker"
-	_, ok := m.workerRequestCount[name]
-	require.False(t, ok)
+	inputs := []struct {
+		name     string
+		c        prometheus.Collector
+		metadata string
+		expect   string
+	}{
+		{
+			name: "Testing BusyWorkers",
+			c:    m.busyWorkers,
+			metadata: `
+				# HELP frankenphp_busy_workers Number of busy PHP workers for this worker
+				# TYPE frankenphp_busy_workers gauge
+			`,
+			expect: `
+				frankenphp_busy_workers{worker="test_worker"} 1
+			`,
+		},
+	}
+
+	for _, input := range inputs {
+		t.Run(input.name, func(t *testing.T) {
+			require.NoError(t, testutil.CollectAndCompare(input.c, strings.NewReader(input.metadata+input.expect)))
+		})
+
+	}
+}
+
+func TestPrometheusMetrics_TestStopReasonCrash(t *testing.T) {
+	m := createPrometheusMetrics()
+	m.TotalWorkers("test_worker", 2)
+	m.StopWorker("test_worker", StopReasonCrash)
+
+	inputs := []struct {
+		name     string
+		c        prometheus.Collector
+		metadata string
+		expect   string
+	}{
+		{
+			name: "Testing BusyThreads",
+			c:    m.busyThreads,
+			metadata: `
+				# HELP frankenphp_busy_threads
+				# TYPE frankenphp_busy_threads gauge
+			`,
+			expect: `
+				frankenphp_busy_threads -1
+			`,
+		},
+		{
+			name: "Testing TotalWorkers",
+			c:    m.totalWorkers,
+			metadata: `
+				# HELP frankenphp_total_workers Total number of PHP workers for this worker
+				# TYPE frankenphp_total_workers gauge
+			`,
+			expect: `
+				frankenphp_total_workers{worker="test_worker"} -1
+			`,
+		},
+		{
+			name: "Testing ReadyWorkers",
+			c:    m.readyWorkers,
+			metadata: `
+				# HELP frankenphp_ready_workers Running workers that have successfully called frankenphp_handle_request at least once
+				# TYPE frankenphp_ready_workers gauge
+			`,
+			expect: `
+				frankenphp_ready_workers{worker="test_worker"} -1
+			`,
+		},
+		{
+			name: "Testing WorkerCrashes",
+			c:    m.workerCrashes,
+			metadata: `
+				# HELP frankenphp_worker_crashes Number of PHP worker crashes for this worker
+				# TYPE frankenphp_worker_crashes counter
+			`,
+			expect: `
+				frankenphp_worker_crashes{worker="test_worker"} 1
+			`,
+		},
+	}
+
+	for _, input := range inputs {
+		t.Run(input.name, func(t *testing.T) {
+			require.NoError(t, testutil.CollectAndCompare(input.c, strings.NewReader(input.metadata+input.expect)))
+		})
+
+	}
 }

options.go

@@ -23,6 +23,7 @@ type opt struct {
 }
 
 type workerOpt struct {
+	name     string
 	fileName string
 	num      int
 	env      PreparedEnv
@@ -55,9 +56,9 @@ func WithMetrics(m Metrics) Option {
 }
 
 // WithWorkers configures the PHP workers to start.
-func WithWorkers(fileName string, num int, env map[string]string, watch []string) Option {
+func WithWorkers(name string, fileName string, num int, env map[string]string, watch []string) Option {
 	return func(o *opt) error {
-		o.workers = append(o.workers, workerOpt{fileName, num, PrepareEnv(env), watch})
+		o.workers = append(o.workers, workerOpt{name, fileName, num, PrepareEnv(env), watch})
 
 		return nil
 	}

phpmainthread_test.go

@@ -88,12 +88,14 @@ func TestTransitionThreadsWhileDoingRequests(t *testing.T) {
 	isDone := atomic.Bool{}
 	wg := sync.WaitGroup{}
 	worker1Path := testDataPath + "/transition-worker-1.php"
+	worker1Name := "worker-1"
 	worker2Path := testDataPath + "/transition-worker-2.php"
+	worker2Name := "worker-2"
 
 	assert.NoError(t, Init(
 		WithNumThreads(numThreads),
-		WithWorkers(worker1Path, 1, map[string]string{}, []string{}),
-		WithWorkers(worker2Path, 1, map[string]string{}, []string{}),
+		WithWorkers(worker1Name, worker1Path, 1, map[string]string{"ENV1": "foo"}, []string{}),
+		WithWorkers(worker2Name, worker2Path, 1, map[string]string{"ENV1": "foo"}, []string{}),
 		WithLogger(zap.NewNop()),
 	))
 

scaling.go

@@ -101,7 +101,7 @@ func scaleWorkerThread(worker *worker) {
 	thread, err := addWorkerThread(worker)
 	if err != nil {
 		if c := logger.Check(zapcore.WarnLevel, "could not increase max_threads, consider raising this limit"); c != nil {
-			c.Write(zap.String("worker", worker.fileName), zap.Error(err))
+			c.Write(zap.String("worker", worker.name), zap.Error(err))
 		}
 		return
 	}

scaling_test.go

@@ -31,11 +31,12 @@ func TestScaleARegularThreadUpAndDown(t *testing.T) {
 }
 
 func TestScaleAWorkerThreadUpAndDown(t *testing.T) {
+	workerName := "worker1"
 	workerPath := testDataPath + "/transition-worker-1.php"
 	assert.NoError(t, Init(
 		WithNumThreads(2),
 		WithMaxThreads(3),
-		WithWorkers(workerPath, 1, map[string]string{}, []string{}),
+		WithWorkers(workerName, workerPath, 1, map[string]string{}, []string{}),
 		WithLogger(zap.NewNop()),
 	))
 

threadworker.go

@@ -76,7 +76,7 @@ func (handler *workerThread) name() string {
 
 func setupWorkerScript(handler *workerThread, worker *worker) {
 	handler.backoff.wait()
-	metrics.StartWorker(worker.fileName)
+	metrics.StartWorker(worker.name)
 
 	// Create a dummy request to set up the worker
 	fc, err := newDummyContext(
@@ -96,7 +96,7 @@ func setupWorkerScript(handler *workerThread, worker *worker) {
 	handler.isBootingScript = true
 	clearSandboxedEnv(handler.thread)
 	if c := logger.Check(zapcore.DebugLevel, "starting"); c != nil {
-		c.Write(zap.String("worker", worker.fileName), zap.Int("thread", handler.thread.threadIndex))
+		c.Write(zap.String("worker", worker.name), zap.Int("thread", handler.thread.threadIndex))
 	}
 }
 
@@ -114,30 +114,30 @@ func tearDownWorkerScript(handler *workerThread, exitStatus int) {
 	// on exit status 0 we just run the worker script again
 	if exitStatus == 0 && !handler.isBootingScript {
 		// TODO: make the max restart configurable
-		metrics.StopWorker(worker.fileName, StopReasonRestart)
+		metrics.StopWorker(worker.name, StopReasonRestart)
 		handler.backoff.recordSuccess()
 		if c := logger.Check(zapcore.DebugLevel, "restarting"); c != nil {
-			c.Write(zap.String("worker", worker.fileName))
+			c.Write(zap.String("worker", worker.name))
 		}
 		return
 	}
 
 	// worker has thrown a fatal error or has not reached frankenphp_handle_request
-	metrics.StopWorker(worker.fileName, StopReasonCrash)
+	metrics.StopWorker(worker.name, StopReasonCrash)
 
 	if !handler.isBootingScript {
 		// fatal error (could be due to timeouts, etc.)
 		return
 	}
 
-	logger.Error("worker script has not reached frankenphp_handle_request", zap.String("worker", worker.fileName))
+	logger.Error("worker script has not reached frankenphp_handle_request", zap.String("worker", worker.name))
 
 	// panic after exponential backoff if the worker has never reached frankenphp_handle_request
 	if handler.backoff.recordFailure() {
 		if !watcherIsEnabled && !handler.state.is(stateReady) {
-			logger.Panic("too many consecutive worker failures", zap.String("worker", worker.fileName), zap.Int("failures", handler.backoff.failureCount))
+			logger.Panic("too many consecutive worker failures", zap.String("worker", worker.name), zap.Int("failures", handler.backoff.failureCount))
 		}
-		logger.Warn("many consecutive worker failures", zap.String("worker", worker.fileName), zap.Int("failures", handler.backoff.failureCount))
+		logger.Warn("many consecutive worker failures", zap.String("worker", worker.name), zap.Int("failures", handler.backoff.failureCount))
 	}
 }
 
@@ -147,7 +147,7 @@ func (handler *workerThread) waitForWorkerRequest() bool {
 	handler.thread.Unpin()
 
 	if c := logger.Check(zapcore.DebugLevel, "waiting for request"); c != nil {
-		c.Write(zap.String("worker", handler.worker.fileName))
+		c.Write(zap.String("worker", handler.worker.name))
 	}
 
 	// Clear the first dummy request created to initialize the worker
@@ -162,7 +162,7 @@ func (handler *workerThread) waitForWorkerRequest() bool {
 	// 'stateTransitionComplete' is only true on the first boot of the worker script,
 	// while 'isBootingScript' is true on every boot of the worker script
 	if handler.state.is(stateTransitionComplete) {
-		metrics.ReadyWorker(handler.worker.fileName)
+		metrics.ReadyWorker(handler.worker.name)
 		handler.state.set(stateReady)
 	}
 
@@ -172,7 +172,7 @@ func (handler *workerThread) waitForWorkerRequest() bool {
 	select {
 	case <-handler.thread.drainChan:
 		if c := logger.Check(zapcore.DebugLevel, "shutting down"); c != nil {
-			c.Write(zap.String("worker", handler.worker.fileName))
+			c.Write(zap.String("worker", handler.worker.name))
 		}
 
 		// flush the opcache when restarting due to watcher or admin api
@@ -190,13 +190,13 @@ func (handler *workerThread) waitForWorkerRequest() bool {
 	handler.state.markAsWaiting(false)
 
 	if c := logger.Check(zapcore.DebugLevel, "request handling started"); c != nil {
-		c.Write(zap.String("worker", handler.worker.fileName), zap.String("url", fc.request.RequestURI))
+		c.Write(zap.String("worker", handler.worker.name), zap.String("url", fc.request.RequestURI))
 	}
 
 	if err := updateServerContext(handler.thread, fc, true); err != nil {
 		// Unexpected error or invalid request
 		if c := logger.Check(zapcore.DebugLevel, "unexpected error"); c != nil {
-			c.Write(zap.String("worker", handler.worker.fileName), zap.String("url", fc.request.RequestURI), zap.Error(err))
+			c.Write(zap.String("worker", handler.worker.name), zap.String("url", fc.request.RequestURI), zap.Error(err))
 		}
 		fc.rejectBadRequest(err.Error())
 		handler.workerContext = nil

worker.go

@@ -4,15 +4,16 @@ package frankenphp
 import "C"
 import (
 	"fmt"
-	"github.com/dunglas/frankenphp/internal/fastabs"
 	"sync"
 	"time"
 
+	"github.com/dunglas/frankenphp/internal/fastabs"
 	"github.com/dunglas/frankenphp/internal/watcher"
 )
 
 // represents a worker script and can have many threads assigned to it
 type worker struct {
+	name        string
 	fileName    string
 	num         int
 	env         PreparedEnv
@@ -75,6 +76,7 @@ func newWorker(o workerOpt) (*worker, error) {
 
 	o.env["FRANKENPHP_WORKER\x00"] = "1"
 	w := &worker{
+		name:        o.name,
 		fileName:    absFileName,
 		num:         o.num,
 		env:         o.env,
@@ -170,7 +172,7 @@ func (worker *worker) countThreads() int {
 }
 
 func (worker *worker) handleRequest(fc *frankenPHPContext) {
-	metrics.StartWorkerRequest(fc.scriptFilename)
+	metrics.StartWorkerRequest(worker.name)
 
 	// dispatch requests to all worker threads in order
 	worker.threadMutex.RLock()
@@ -179,7 +181,7 @@ func (worker *worker) handleRequest(fc *frankenPHPContext) {
 		case thread.requestChan <- fc:
 			worker.threadMutex.RUnlock()
 			<-fc.done
-			metrics.StopWorkerRequest(worker.fileName, time.Since(fc.startedAt))
+			metrics.StopWorkerRequest(worker.name, time.Since(fc.startedAt))
 			return
 		default:
 			// thread is busy, continue
@@ -188,13 +190,13 @@ func (worker *worker) handleRequest(fc *frankenPHPContext) {
 	worker.threadMutex.RUnlock()
 
 	// if no thread was available, mark the request as queued and apply the scaling strategy
-	metrics.QueuedWorkerRequest(fc.scriptFilename)
+	metrics.QueuedWorkerRequest(worker.name)
 	for {
 		select {
 		case worker.requestChan <- fc:
-			metrics.DequeuedWorkerRequest(fc.scriptFilename)
+			metrics.DequeuedWorkerRequest(worker.name)
 			<-fc.done
-			metrics.StopWorkerRequest(worker.fileName, time.Since(fc.startedAt))
+			metrics.StopWorkerRequest(worker.name, time.Since(fc.startedAt))
 			return
 		case scaleChan <- fc:
 			// the request has triggered scaling, continue to wait for a thread

worker_test.go

@@ -118,8 +118,8 @@ func TestWorkerGetOpt(t *testing.T) {
 
 func ExampleServeHTTP_workers() {
 	if err := frankenphp.Init(
-		frankenphp.WithWorkers("worker1.php", 4, map[string]string{"ENV1": "foo"}, []string{}),
-		frankenphp.WithWorkers("worker2.php", 2, map[string]string{"ENV2": "bar"}, []string{}),
+		frankenphp.WithWorkers("worker1", "worker1.php", 4, map[string]string{"ENV1": "foo"}, []string{}),
+		frankenphp.WithWorkers("worker1", "worker2.php", 2, map[string]string{"ENV2": "bar"}, []string{}),
 	); err != nil {
 		panic(err)
 	}