Add unit to latency metrics.

Add `seconds` unit to latency metrics based on uptream naming
convention[0].

[0]: https://prometheus.io/docs/practices/naming/#metric-names

doc/administration/monitoring/prometheus/gitlab_metrics.md

@@ -27,15 +27,15 @@ In this experimental phase, only a few metrics are available:
 | ------ | ---- | ----------- |
 | db_ping_timeout | Gauge | Whether or not the last database ping timed out |
 | db_ping_success | Gauge | Whether or not the last database ping succeeded |
-| db_ping_latency | Gauge | Round trip time of the database ping |
+| db_ping_latency_seconds | Gauge | Round trip time of the database ping |
 | redis_ping_timeout | Gauge | Whether or not the last redis ping timed out |
 | redis_ping_success | Gauge | Whether or not the last redis ping succeeded |
-| redis_ping_latency | Gauge | Round trip time of the redis ping |
-| filesystem_access_latency | gauge | Latency in accessing a specific filesystem |
+| redis_ping_latency_seconds | Gauge | Round trip time of the redis ping |
+| filesystem_access_latency_seconds | gauge | Latency in accessing a specific filesystem |
 | filesystem_accessible | gauge | Whether or not a specific filesystem is accessible |
-| filesystem_write_latency | gauge | Write latency of a specific filesystem |
+| filesystem_write_latency_seconds | gauge | Write latency of a specific filesystem |
 | filesystem_writable | gauge | Whether or not the filesystem is writable |
-| filesystem_read_latency | gauge | Read latency of a specific filesystem |
+| filesystem_read_latency_seconds | gauge | Read latency of a specific filesystem |
 | filesystem_readable | gauge | Whether or not the filesystem is readable |
 | user_sessions_logins | Counter | Counter of how many users have logged in | 
 

lib/gitlab/health_checks/fs_shards_check.rb

@@ -35,9 +35,9 @@ module Gitlab
           repository_storages.flat_map do |storage_name|
             tmp_file_path = tmp_file_path(storage_name)
             [
-              operation_metrics(:filesystem_accessible, :filesystem_access_latency, -> { storage_stat_test(storage_name) }, shard: storage_name),
-              operation_metrics(:filesystem_writable, :filesystem_write_latency, -> { storage_write_test(tmp_file_path) }, shard: storage_name),
-              operation_metrics(:filesystem_readable, :filesystem_read_latency, -> { storage_read_test(tmp_file_path) }, shard: storage_name)
+              operation_metrics(:filesystem_accessible, :filesystem_access_latency_seconds, -> { storage_stat_test(storage_name) }, shard: storage_name),
+              operation_metrics(:filesystem_writable, :filesystem_write_latency_seconds, -> { storage_write_test(tmp_file_path) }, shard: storage_name),
+              operation_metrics(:filesystem_readable, :filesystem_read_latency_seconds, -> { storage_read_test(tmp_file_path) }, shard: storage_name)
             ].flatten
           end
         end

lib/gitlab/health_checks/simple_abstract_check.rb

@@ -20,7 +20,7 @@ module Gitlab
           [
             metric("#{metric_prefix}_timeout", result.is_a?(Timeout::Error) ? 1 : 0),
             metric("#{metric_prefix}_success", is_successful?(result) ? 1 : 0),
-            metric("#{metric_prefix}_latency", elapsed)
+            metric("#{metric_prefix}_latency_seconds", elapsed)
           ]
         end
       end

spec/controllers/metrics_controller_spec.rb

@@ -24,7 +24,7 @@ describe MetricsController do
 
         expect(response.body).to match(/^db_ping_timeout 0$/)
         expect(response.body).to match(/^db_ping_success 1$/)
-        expect(response.body).to match(/^db_ping_latency [0-9\.]+$/)
+        expect(response.body).to match(/^db_ping_latency_seconds [0-9\.]+$/)
       end
 
       it 'returns Redis ping metrics' do
@@ -32,7 +32,7 @@ describe MetricsController do
 
         expect(response.body).to match(/^redis_ping_timeout 0$/)
         expect(response.body).to match(/^redis_ping_success 1$/)
-        expect(response.body).to match(/^redis_ping_latency [0-9\.]+$/)
+        expect(response.body).to match(/^redis_ping_latency_seconds [0-9\.]+$/)
       end
 
       it 'returns Caching ping metrics' do
@@ -40,7 +40,7 @@ describe MetricsController do
 
         expect(response.body).to match(/^redis_cache_ping_timeout 0$/)
         expect(response.body).to match(/^redis_cache_ping_success 1$/)
-        expect(response.body).to match(/^redis_cache_ping_latency [0-9\.]+$/)
+        expect(response.body).to match(/^redis_cache_ping_latency_seconds [0-9\.]+$/)
       end
 
       it 'returns Queues ping metrics' do
@@ -48,7 +48,7 @@ describe MetricsController do
 
         expect(response.body).to match(/^redis_queues_ping_timeout 0$/)
         expect(response.body).to match(/^redis_queues_ping_success 1$/)
-        expect(response.body).to match(/^redis_queues_ping_latency [0-9\.]+$/)
+        expect(response.body).to match(/^redis_queues_ping_latency_seconds [0-9\.]+$/)
       end
 
       it 'returns SharedState ping metrics' do
@@ -56,17 +56,17 @@ describe MetricsController do
 
         expect(response.body).to match(/^redis_shared_state_ping_timeout 0$/)
         expect(response.body).to match(/^redis_shared_state_ping_success 1$/)
-        expect(response.body).to match(/^redis_shared_state_ping_latency [0-9\.]+$/)
+        expect(response.body).to match(/^redis_shared_state_ping_latency_seconds [0-9\.]+$/)
       end
 
       it 'returns file system check metrics' do
         get :index
 
-        expect(response.body).to match(/^filesystem_access_latency{shard="default"} [0-9\.]+$/)
+        expect(response.body).to match(/^filesystem_access_latency_seconds{shard="default"} [0-9\.]+$/)
         expect(response.body).to match(/^filesystem_accessible{shard="default"} 1$/)
-        expect(response.body).to match(/^filesystem_write_latency{shard="default"} [0-9\.]+$/)
+        expect(response.body).to match(/^filesystem_write_latency_seconds{shard="default"} [0-9\.]+$/)
         expect(response.body).to match(/^filesystem_writable{shard="default"} 1$/)
-        expect(response.body).to match(/^filesystem_read_latency{shard="default"} [0-9\.]+$/)
+        expect(response.body).to match(/^filesystem_read_latency_seconds{shard="default"} [0-9\.]+$/)
         expect(response.body).to match(/^filesystem_readable{shard="default"} 1$/)
       end
 

spec/lib/gitlab/health_checks/fs_shards_check_spec.rb

@@ -109,9 +109,9 @@ describe Gitlab::HealthChecks::FsShardsCheck do
           expect(subject).to include(an_object_having_attributes(name: :filesystem_readable, value: 0))
           expect(subject).to include(an_object_having_attributes(name: :filesystem_writable, value: 0))
 
-          expect(subject).to include(an_object_having_attributes(name: :filesystem_access_latency, value: be >= 0))
-          expect(subject).to include(an_object_having_attributes(name: :filesystem_read_latency, value: be >= 0))
-          expect(subject).to include(an_object_having_attributes(name: :filesystem_write_latency, value: be >= 0))
+          expect(subject).to include(an_object_having_attributes(name: :filesystem_access_latency_seconds, value: be >= 0))
+          expect(subject).to include(an_object_having_attributes(name: :filesystem_read_latency_seconds, value: be >= 0))
+          expect(subject).to include(an_object_having_attributes(name: :filesystem_write_latency_seconds, value: be >= 0))
         end
       end
 
@@ -127,9 +127,9 @@ describe Gitlab::HealthChecks::FsShardsCheck do
           expect(subject).to include(an_object_having_attributes(name: :filesystem_readable, value: 1))
           expect(subject).to include(an_object_having_attributes(name: :filesystem_writable, value: 1))
 
-          expect(subject).to include(an_object_having_attributes(name: :filesystem_access_latency, value: be >= 0))
-          expect(subject).to include(an_object_having_attributes(name: :filesystem_read_latency, value: be >= 0))
-          expect(subject).to include(an_object_having_attributes(name: :filesystem_write_latency, value: be >= 0))
+          expect(subject).to include(an_object_having_attributes(name: :filesystem_access_latency_seconds, value: be >= 0))
+          expect(subject).to include(an_object_having_attributes(name: :filesystem_read_latency_seconds, value: be >= 0))
+          expect(subject).to include(an_object_having_attributes(name: :filesystem_write_latency_seconds, value: be >= 0))
         end
       end
     end
@@ -159,9 +159,9 @@ describe Gitlab::HealthChecks::FsShardsCheck do
         expect(subject).to include(an_object_having_attributes(name: :filesystem_readable, value: 0))
         expect(subject).to include(an_object_having_attributes(name: :filesystem_writable, value: 0))
 
-        expect(subject).to include(an_object_having_attributes(name: :filesystem_access_latency, value: be >= 0))
-        expect(subject).to include(an_object_having_attributes(name: :filesystem_read_latency, value: be >= 0))
-        expect(subject).to include(an_object_having_attributes(name: :filesystem_write_latency, value: be >= 0))
+        expect(subject).to include(an_object_having_attributes(name: :filesystem_access_latency_seconds, value: be >= 0))
+        expect(subject).to include(an_object_having_attributes(name: :filesystem_read_latency_seconds, value: be >= 0))
+        expect(subject).to include(an_object_having_attributes(name: :filesystem_write_latency_seconds, value: be >= 0))
       end
     end
   end

spec/lib/gitlab/health_checks/simple_check_shared.rb

@@ -8,7 +8,7 @@ shared_context 'simple_check' do |metrics_prefix, check_name, success_result|
 
       it { is_expected.to include(have_attributes(name: "#{metrics_prefix}_success", value: 1)) }
       it { is_expected.to include(have_attributes(name: "#{metrics_prefix}_timeout", value: 0)) }
-      it { is_expected.to include(have_attributes(name: "#{metrics_prefix}_latency", value: be >= 0)) }
+      it { is_expected.to include(have_attributes(name: "#{metrics_prefix}_latency_seconds", value: be >= 0)) }
     end
 
     context 'Check is misbehaving' do
@@ -18,7 +18,7 @@ shared_context 'simple_check' do |metrics_prefix, check_name, success_result|
 
       it { is_expected.to include(have_attributes(name: "#{metrics_prefix}_success", value: 0)) }
       it { is_expected.to include(have_attributes(name: "#{metrics_prefix}_timeout", value: 0)) }
-      it { is_expected.to include(have_attributes(name: "#{metrics_prefix}_latency", value: be >= 0)) }
+      it { is_expected.to include(have_attributes(name: "#{metrics_prefix}_latency_seconds", value: be >= 0)) }
     end
 
     context 'Check is timeouting' do
@@ -28,7 +28,7 @@ shared_context 'simple_check' do |metrics_prefix, check_name, success_result|
 
       it { is_expected.to include(have_attributes(name: "#{metrics_prefix}_success", value: 0)) }
       it { is_expected.to include(have_attributes(name: "#{metrics_prefix}_timeout", value: 1)) }
-      it { is_expected.to include(have_attributes(name: "#{metrics_prefix}_latency", value: be >= 0)) }
+      it { is_expected.to include(have_attributes(name: "#{metrics_prefix}_latency_seconds", value: be >= 0)) }
     end
   end