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Diffstat (limited to 'config/unicorn.rb.example')
| -rw-r--r-- | config/unicorn.rb.example | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/config/unicorn.rb.example b/config/unicorn.rb.example index cc10da2bd88..220a0191160 100644 --- a/config/unicorn.rb.example +++ b/config/unicorn.rb.example @@ -81,6 +81,17 @@ GC.respond_to?(:copy_on_write_friendly=) and # fast LAN. check_client_connection false +before_exec do |server| + # The following is necessary to ensure stale Prometheus metrics don't + # accumulate over time. It needs to be done in this hook as opposed to + # inside an init script to ensure metrics files aren't deleted after new + # unicorn workers start after a SIGUSR2 is received. + if ENV['prometheus_multiproc_dir'] + old_metrics = Dir[File.join(ENV['prometheus_multiproc_dir'], '*.db')] + FileUtils.rm_rf(old_metrics) + end +end + before_fork do |server, worker| # the following is highly recommended for Rails + "preload_app true" # as there's no need for the master process to hold a connection |