gojek / darkroom / 304
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Prometheus support (#56)

* integrated prometheus service, exposed metrics, changed storage to local for testing and added gcc support  for Docker

* created MetricService, implements prometheus metrics to track durations in manipulator and errors in ImageHandler

* changed to custom prometheus registry to avoid duplicate metrics registration

* created mock_metric_service for usage in tests

* added integration test for prometheus metrics

* removed volumes, used for testing for darkroom service

* Initialized prometheus registry in runtime context and passed it to routes, so removed 'AddMetricsEndPoint()'

* removed runtime initialization of prometheus registry to avoid panic due to duplicate registration, moved it to dependencies

* updated prometheus golang client to v1.7.1

* added assertions on 'Count' methods of MetricService

* grouped all metrics into two, image_prcoess_duration and image_handler_errors with additional labels

* added grafana provisioning for metrics

* initialized runtime prometheus registry in root, changed ports in docker-compose

* implemented statsD from MetricService, changed grafana datasource

* changed runtime prometheus Pedantic registry to custom

* added a switch for MetricService based on env variables

* update README, changed query for grafana dashboard

* added NoOpMetricService as default when metric system is not specified

Co-authored-by: Chaitanya Reddy <chaitanya@chaitanya.reddy>

1182 of 1302 relevant lines covered (90.78%)

5007.72 hits per line

Jobs
ID Job ID Ran Files Coverage
1 304.1 (GO111MODULE=on) 0
90.78
 Travis Job 304.1
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