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Add GVL contention metrics via gvltools (#2538)

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* Add GVL contention metrics via gvltools and Yabeda

Expose per-request and process-wide GVL wait time as Prometheus metrics
to diagnose suspected GVL contention from Solid Cable and Action Cable
threads in Puma workers.

Metrics: gvl_request_wait_seconds (histogram), gvl_waiting_threads
(gauge), gvl_global_timer_total_seconds (gauge).

* Add unit: :seconds to GVL histogram for consistency
This commit is contained in:
Jeremy Daer
2026-02-12 16:28:29 -08:00
committed by GitHub
parent 8aa934a594
commit a5a5a62169
5 changed files with 61 additions and 0 deletions
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Gemfile.saas
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@@ -24,3 +24,4 @@ gem "yabeda-puma-plugin"
gem "yabeda-rails"
gem "webrick" # required for yabeda-prometheus metrics server
gem "prometheus-client-mmap", "~> 1.3"
gem "gvltools"