PHOENIX-6879 Prometheus endpoint implementation #119
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Notes: - added a new servlet (/prometheus) for exposing Prometheus format metrics - metrics description can be enabled by "/prometheus?description=true" query string - metrics can be filtered by "/prometheus?qry=xyz" query string
| HandlerList list = (HandlerList) handlers[0]; | ||
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| ServletContextHandler ctx = new ServletContextHandler(); | ||
| ctx.setContextPath("/prometheus"); |
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Prometheus typically expects and endpoint path to be "/metrics".
| for (AbstractMetric metrics : metricsRecord.metrics()) { | ||
| if (metrics.type() == MetricType.COUNTER || metrics.type() == MetricType.GAUGE) { | ||
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| String key = toPrometheusName(metricsRecord.name(), metrics.name()); |
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Note that this method and its regexp could be called quite often: per metricRecord, per metric, per metric scrape interval (default scrape interval is 1 minute) could add to a bit of CPU time... if I am right, I suggest memoizing this function
Notes: - Added some unit tests for PrometheusHadoopServlet and PrometheusEndpointServerCustomizer - Changed PrometheusHadoopServlet.toPrometheusName() function's visibility to package-private
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In this change:
"/prometheus?description=true"query string"/prometheus?qry=xyz"query string