<#import "/templates/guide.adoc" as tmpl> <#import "/templates/kc.adoc" as kc> <#import "/templates/options.adoc" as opts> <#import "/templates/links.adoc" as links> <@tmpl.guide title="Enabling {project_name} Metrics" summary="Learn how to enable and expose metrics from the server" includedOptions="metrics-enabled http-metrics-* cache-metrics-*"> {project_name} has built in support for metrics. This {section} describes how to enable and configure server metrics. == Enabling Metrics It is possible to enable metrics using the build time option `metrics-enabled`: <@kc.start parameters="--metrics-enabled=true"/> == Querying Metrics {project_name} exposes metrics at the following endpoint on the management interface at: * `/metrics` For more information about the management interface, see <@links.server id="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: [source] ---- # 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 ... ---- == Available Metrics The table below summarizes the available metrics groups: [%autowidth] |=== |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 <@links.server id="caching"/> for more details. |===