Merge branch 'use-smoother-signal-for-registry-5xx' into 'master'

Fixes https://gitlab.com/gitlab-com/gl-infra/infrastructure/issues/7048

Closes gitlab-com/gl-infra/infrastructure#7048

See merge request gitlab-com/runbooks!1148
3 jobs for master in 1 minute and 53 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Test
failed #535788
check_alerts

00:01:53

passed #535783
test

00:00:28

 
  Images
skipped #535792
allowed to fail manual
build_jsonnet_image
 
Name Stage Failure
failed
check_alerts Test
2019/06/20 04:07:02 Checking gitlab_workhorse_git_http_sessions_active:total:stddev_over_time_1w
2019/06/20 04:07:02 Checking gitlab_workhorse_git_http_sessions_active:total
====== Possibly obsolete alerts:
deadman_15m_missing_series
deadman_15m_expired
CICDTooManyRunningJobsPerNamespaceOnSharedRunners
BlockedUserAttemptsIsHigh
exit status 1
ERROR: Job failed: exit code 1