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c099d665a2
Add configurable max_idle_time for autoscaled threads
The idle timeout for autoscaled threads is currently hardcoded to 5
seconds. With bursty traffic patterns, this causes threads to be
deactivated too quickly, leading to repeated cold-start overhead when
the next burst arrives.
This PR replaces the hardcoded constant with a configurable
max_idle_time directive, allowing users to tune how long idle
autoscaled threads stay alive before deactivation. The default remains 5
seconds, preserving existing behavior.
Usage:
Caddyfile:
````
frankenphp {
max_idle_time 30s
}
````
JSON config:
```
{
"frankenphp": {
"max_idle_time": "30s"
}
}
````
Changes:
- New max_idle_time Caddyfile directive and JSON config option
- New WithMaxIdleTime functional option
- Replaced hardcoded maxThreadIdleTime constant with configurable
maxIdleTime variable
- Added tests for custom and default idle time behavior
- Updated docs