Write to InfluxDB directly via UDP

This removes the need for Sidekiq and any overhead/problems introduced
by TCP. There are a few things to take into account:

1. When writing data to InfluxDB you may still get an error if the
   server becomes unavailable during the write. Because of this we're
   catching all exceptions and just ignore them (for now).
2. Writing via UDP apparently requires the timestamp to be in
   nanoseconds. Without this data either isn't written properly.
3. Due to the restrictions on UDP buffer sizes we're writing metrics one
   by one, instead of writing all of them at once.

1 files changed, 0 insertions, 7 deletions

diff --git a/lib/gitlab/metrics/sidekiq_middleware.rb b/lib/gitlab/metrics/sidekiq_middleware.rb
index ec10707d1fb..ad441decfa2 100644
--- a/lib/gitlab/metrics/sidekiq_middleware.rb
+++ b/lib/gitlab/metrics/sidekiq_middleware.rb
@@ -5,13 +5,6 @@ module Gitlab
     # This middleware is intended to be used as a server-side middleware.
     class SidekiqMiddleware
       def call(worker, message, queue)
-        # We don't want to track the MetricsWorker itself as otherwise we'll end
-        # up in an infinite loop.
-        if worker.class == MetricsWorker
-          yield
-          return
-        end
-
         trans = Transaction.new
 
         begin