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Dropwizard metrics and Prometheus collected metrics have different metrics name conventions
Dropwizard and Prometheus use different convention for naming metrics. We use Dropwizard as REST API framework and Prometheus Java Suite collects the Dropwizard metrics for producing http://localhost:8071/metrics/prometheus but it is not converting the metrics names.
Then Promethus complains:
lopez@work:~/dataset_recognition_resources$ curl -s http://localhost:8071/metrics/prometheus | promtool check metrics
io_dropwizard_jetty_MutableServletContextHandler_1xx_responses_total metric names should be written in 'snake_case' not 'camelCase'
io_dropwizard_jetty_MutableServletContextHandler_2xx_responses_total metric names should be written in 'snake_case' not 'camelCase'
io_dropwizard_jetty_MutableServletContextHandler_3xx_responses_total metric names should be written in 'snake_case' not 'camelCase'
io_dropwizard_jetty_MutableServletContextHandler_4xx_responses_total metric names should be written in 'snake_case' not 'camelCase'
io_dropwizard_jetty_MutableServletContextHandler_5xx_responses_total metric names should be written in 'snake_case' not 'camelCase'
io_dropwizard_jetty_MutableServletContextHandler_active_dispatches metric names should be written in 'snake_case' not 'camelCase'
io_dropwizard_jetty_MutableServletContextHandler_active_requests metric names should be written in 'snake_case' not 'camelCase'
io_dropwizard_jetty_MutableServletContextHandler_active_suspended metric names should be written in 'snake_case' not 'camelCase'
io_dropwizard_jetty_MutableServletContextHandler_async_dispatches_total metric names should be written in 'snake_case' not 'camelCase'
io_dropwizard_jetty_MutableServletContextHandler_async_timeouts_total metric names should be written in 'snake_case' not 'camelCase'
io_dropwizard_jetty_MutableServletContextHandler_connect_requests metric names should be written in 'snake_case' not 'camelCase'
io_dropwizard_jetty_MutableServletContextHandler_delete_requests metric names should be written in 'snake_case' not 'camelCase'
jvm_buffers_direct_count non-histogram and non-summary metrics should not have "_count" suffix
jvm_buffers_mapped_count non-histogram and non-summary metrics should not have "_count" suffix
jvm_gc_PS_MarkSweep_count metric names should be written in 'snake_case' not 'camelCase'
jvm_gc_PS_MarkSweep_count non-histogram and non-summary metrics should not have "_count" suffix
jvm_gc_PS_MarkSweep_time metric names should be written in 'snake_case' not 'camelCase'
jvm_gc_PS_Scavenge_count non-histogram and non-summary metrics should not have "_count" suffix
jvm_threads_blocked_count non-histogram and non-summary metrics should not have "_count" suffix
This might create problems for visualization and alerting using Prometheus.
Maybe we could use https://github.com/Sansofts/dropwizard-prometheus
For reference: https://prometheus.io/docs/instrumenting/writing_exporters/#naming https://github.com/micrometer-metrics/micrometer/issues/80#issuecomment-321125165