From cafc784ee1d5d0a0279077272af8ee435bb110e4 Mon Sep 17 00:00:00 2001
From: Yorick Peterse <yorickpeterse@gmail.com>
Date: Thu, 31 Dec 2015 17:55:10 +0100
Subject: [PATCH] Removed tracking of hostnames for metrics

This isn't hugely useful and mostly wastes InfluxDB space. We can re-add
this whenever needed (but only once we really need it).
---
 config/initializers/metrics.rb         | 1 -
 lib/gitlab/metrics.rb                  | 6 ------
 lib/gitlab/metrics/metric.rb           | 6 ++----
 spec/lib/gitlab/metrics/metric_spec.rb | 2 --
 spec/lib/gitlab/metrics_spec.rb        | 6 ------
 5 files changed, 2 insertions(+), 19 deletions(-)

diff --git a/config/initializers/metrics.rb b/config/initializers/metrics.rb
index 94c535dc562..ebb20be7283 100644
--- a/config/initializers/metrics.rb
+++ b/config/initializers/metrics.rb
@@ -1,6 +1,5 @@
 if Gitlab::Metrics.enabled?
   require 'influxdb'
-  require 'socket'
   require 'connection_pool'
   require 'method_source'
 
diff --git a/lib/gitlab/metrics.rb b/lib/gitlab/metrics.rb
index c5b98a0115e..ee88ab34d6c 100644
--- a/lib/gitlab/metrics.rb
+++ b/lib/gitlab/metrics.rb
@@ -38,10 +38,6 @@ module Gitlab
       @pool
     end
 
-    def self.hostname
-      @hostname
-    end
-
     # Returns a relative path and line number based on the last application call
     # frame.
     def self.last_relative_application_frame
@@ -89,8 +85,6 @@ module Gitlab
       value.to_s.gsub('=', '\\=')
     end
 
-    @hostname = Socket.gethostname
-
     # When enabled this should be set before being used as the usual pattern
     # "@foo ||= bar" is _not_ thread-safe.
     if enabled?
diff --git a/lib/gitlab/metrics/metric.rb b/lib/gitlab/metrics/metric.rb
index 8319e628a40..7ea9555cc8c 100644
--- a/lib/gitlab/metrics/metric.rb
+++ b/lib/gitlab/metrics/metric.rb
@@ -17,10 +17,8 @@ module Gitlab
       # Returns a Hash in a format that can be directly written to InfluxDB.
       def to_hash
         {
-          series: @series,
-          tags:   @tags.merge(
-            hostname: Metrics.hostname
-          ),
+          series:    @series,
+          tags:      @tags,
           values:    @values,
           timestamp: @created_at.to_i * 1_000_000_000
         }
diff --git a/spec/lib/gitlab/metrics/metric_spec.rb b/spec/lib/gitlab/metrics/metric_spec.rb
index 9b942855140..f718d536130 100644
--- a/spec/lib/gitlab/metrics/metric_spec.rb
+++ b/spec/lib/gitlab/metrics/metric_spec.rb
@@ -37,8 +37,6 @@ describe Gitlab::Metrics::Metric do
 
       it 'includes the tags' do
         expect(hash[:tags]).to be_an_instance_of(Hash)
-
-        expect(hash[:tags][:hostname]).to be_an_instance_of(String)
       end
 
       it 'includes the values' do
diff --git a/spec/lib/gitlab/metrics_spec.rb b/spec/lib/gitlab/metrics_spec.rb
index c2924708f44..c2782f95c8e 100644
--- a/spec/lib/gitlab/metrics_spec.rb
+++ b/spec/lib/gitlab/metrics_spec.rb
@@ -13,12 +13,6 @@ describe Gitlab::Metrics do
     end
   end
 
-  describe '.hostname' do
-    it 'returns a String containing the hostname' do
-      expect(described_class.hostname).to eq(Socket.gethostname)
-    end
-  end
-
   describe '.last_relative_application_frame' do
     it 'returns an Array containing a file path and line number' do
       file, line = described_class.last_relative_application_frame