Merge branch 'jprovazn-graphql-prometheus' into 'master'

Monitor GraphQL with Prometheus (try 2)

See merge request gitlab-org/gitlab-ce!26917

1 files changed, 43 insertions, 0 deletions

diff --git a/lib/gitlab/graphql/tracing.rb b/lib/gitlab/graphql/tracing.rb
new file mode 100644
index 00000000000..6b505e4262b
--- /dev/null
+++ b/lib/gitlab/graphql/tracing.rb
@@ -0,0 +1,43 @@
+# frozen_string_literal: true
+
+module Gitlab
+  module Graphql
+    class Tracing < GraphQL::Tracing::PlatformTracing
+      self.platform_keys = {
+        'lex' => 'graphql.lex',
+        'parse' => 'graphql.parse',
+        'validate' => 'graphql.validate',
+        'analyze_query' => 'graphql.analyze',
+        'analyze_multiplex' => 'graphql.analyze',
+        'execute_multiplex' => 'graphql.execute',
+        'execute_query' => 'graphql.execute',
+        'execute_query_lazy' => 'graphql.execute',
+        'execute_field' => 'graphql.execute',
+        'execute_field_lazy' => 'graphql.execute'
+      }
+
+      def platform_field_key(type, field)
+        "#{type.name}.#{field.name}"
+      end
+
+      def platform_trace(platform_key, key, data, &block)
+        start = Gitlab::Metrics::System.monotonic_time
+
+        yield
+      ensure
+        duration = Gitlab::Metrics::System.monotonic_time - start
+
+        graphql_duration_seconds.observe({ platform_key: platform_key, key: key }, duration)
+      end
+
+      private
+
+      def graphql_duration_seconds
+        @graphql_duration_seconds ||= Gitlab::Metrics.histogram(
+          :graphql_duration_seconds,
+          'GraphQL execution time'
+        )
+      end
+    end
+  end
+end