Merge branch 'bjk/splay_puma_restarts' into 'master'

Increase splay of Puma worker restarts

See merge request gitlab-org/gitlab!52079

changelogs/unreleased/bjk-splay_puma_restarts.yml

+---
+title: Increase splay of Puma worker restarts
+merge_request: 52079
+author:
+type: other

lib/gitlab/cluster/puma_worker_killer_initializer.rb

@@ -35,6 +35,10 @@ module Gitlab
           # regularly rather than rely on OOM behavior for periodic restarting.
           config.rolling_restart_frequency = 43200 # 12 hours in seconds.
 
+          # Spread the rolling restarts out over 1 hour to avoid too many simultaneous
+          # process startups.
+          config.rolling_restart_splay_seconds = 0.0..3600.0 # 0 to 1 hour in seconds.
+
           observer = Gitlab::Cluster::PumaWorkerKillerObserver.new
           config.pre_term = observer.callback
         end