Chapter 20. Enabling Red Hat build of Keycloak Metrics Red Hat build of Keycloak has built in support for metrics. This chapter describes how to enable and configure server metrics. 20.1. Enabling Metrics It is possible to enable metrics using the build time option metrics-enabled : bin/kc.[sh|bat] start --metrics-enabled=true 20.2. Querying Metrics Red Hat build of Keycloak exposes metrics at the following endpoint on the management interface at: /metrics For more information about the management interface, see Configuring the Management Interface . The response from the endpoint uses a application/openmetrics-text content type and it is based on the Prometheus (OpenMetrics) text format. The snippet below is an example of a response: 20.3. Available Metrics The table below summarizes the available metrics groups: Metric Description System A set of system-level metrics related to CPU and memory usage. JVM A set of metrics from the Java Virtual Machine (JVM) related to GC, and heap. Database A set of metrics from the database connection pool, if using a database. HTTP A set of global and individual metrics from the HTTP endpoints Cache A set of metrics from Infinispan caches. See Configuring distributed caches for more details. 20.4. Relevant options Value cache-metrics-histograms-enabled Enable histograms for metrics for the embedded caches. CLI: --cache-metrics-histograms-enabled Env: KC_CACHE_METRICS_HISTOGRAMS_ENABLED Available only when metrics are enabled true , false (default) http-metrics-histograms-enabled Enables a histogram with default buckets for the duration of HTTP server requests. CLI: --http-metrics-histograms-enabled Env: KC_HTTP_METRICS_HISTOGRAMS_ENABLED Available only when metrics are enabled true , false (default) http-metrics-slos Service level objectives for HTTP server requests. Use this instead of the default histogram, or use it in combination to add additional buckets. Specify a list of comma-separated values defined in milliseconds. Example with buckets from 5ms to 10s: 5,10,25,50,250,500,1000,2500,5000,10000 CLI: --http-metrics-slos Env: KC_HTTP_METRICS_SLOS Available only when metrics are enabled metrics-enabled 🛠 If the server should expose metrics. If enabled, metrics are available at the /metrics endpoint. CLI: --metrics-enabled Env: KC_METRICS_ENABLED true , false (default)

Commands:
bin/kc.[sh|bat] start --metrics-enabled=true
HELP base_gc_total Displays the total number of collections that have occurred. This attribute lists -1 if the collection count is undefined for this collector. TYPE base_gc_total counter base_gc_total{name="G1 Young Generation",} 14.0 HELP jvm_memory_usage_after_gc_percent The percentage of long-lived heap pool used after the last GC event, in the range [0..1] TYPE jvm_memory_usage_after_gc_percent gauge jvm_memory_usage_after_gc_percent{area="heap",pool="long-lived",} 0.0 HELP jvm_threads_peak_threads The peak live thread count since the Java virtual machine started or peak was reset TYPE jvm_threads_peak_threads gauge jvm_threads_peak_threads 113.0 HELP agroal_active_count Number of active connections. These connections are in use and not available to be acquired. TYPE agroal_active_count gauge agroal_active_count{datasource="default",} 0.0 HELP base_memory_maxHeap_bytes Displays the maximum amount of memory, in bytes, that can be used for memory management. TYPE base_memory_maxHeap_bytes gauge base_memory_maxHeap_bytes 1.6781410304E10 HELP process_start_time_seconds Start time of the process since unix epoch. TYPE process_start_time_seconds gauge process_start_time_seconds 1.675188449054E9 HELP system_load_average_1m The sum of the number of runnable entities queued to available processors and the number of runnable entities running on the available processors averaged over a period of time TYPE system_load_average_1m gauge system_load_average_1m 4.005859375