Merge branch 'adjust-sigkill-delay-in-sidekiq-cluster' into 'master'

Respect sidekiq timeout when hard-killing workers

See merge request gitlab-org/gitlab!38242

config/initializers/sidekiq_cluster.rb

@@ -14,10 +14,10 @@ if ENV['ENABLE_SIDEKIQ_CLUSTER']
       if Process.ppid != parent
         Process.kill(:TERM, Process.pid)
 
-        # Wait for just a few extra seconds for a final attempt to
-        # gracefully terminate. Considering the parent (cluster) process
-        # have changed (SIGKILL'd), it shouldn't take long to shutdown.
-        sleep(5)
+        # Allow sidekiq to cleanly terminate and push any running jobs back
+        # into the queue.  We use the configured timeout and add a small
+        # grace period
+        sleep(Sidekiq.options[:timeout] + 5)
 
         # Signaling the Sidekiq Pgroup as KILL is not forwarded to
         # a possible child process. In Sidekiq Cluster, all child Sidekiq