Keycloak Metrics

Provides metrics for Keycloak user/admin events and user/client/session count. Tested on Keycloak 22-26.

Why?

aerogear/keycloak-metrics-spi is an alternative to this plugin but is not well maintained. This implementation is different:

• no Prometheus push (event listener only adds counter to Micrometer)
• no realm specific Prometheus endpoint, only /metrics (from Quarkus)
• no jvm/http metrics, this is already included in Keycloak
• different metric names, can relace model ids with name (see configuration)
• deployed to maven central and very small (15 kb vs. 151 KB aerogear/keycloak-metrics-spi)
• gauge for active/offline sessions and user/client count

What?

Resuses micrometer from Quarkus distribution to add metrics for Keycloak for events.

User Events

User events are added with key keycloak_event_user_total and tags:

• type: EventType from Event#type
• realm: realm id from Event#realmId
• client: client id from Event#clientId, unknown client_ids are grouped into UNKOWN
• error: error from Event#error, only present for error types

Examples:

keycloak_event_user_total{client="test",realm="9039a0b5-e8c9-437a-a02e-9d91b04548a4",type="LOGIN",error="",} 2.0
keycloak_event_user_total{client="test",realm="1fdb3465-1675-49e8-88ad-292e2f42ee72",type="LOGIN",error="",} 1.0
keycloak_event_user_total{client="test",realm="1fdb3465-1675-49e8-88ad-292e2f42ee72",type="LOGIN_ERROR",error="invalid_user_credentials",} 1.0
keycloak_event_user_total{client="UNKNOWN",realm="1fdb3465-1675-49e8-88ad-292e2f42ee72",type="LOGIN_ERROR",error="invalid_user_credentials",} 1.0

Admin Events

Admin events are added with key keycloak_event_admin_total and tags:

• realm: realm id from AdminEvent#realmId
• operation: OperationType from AdminEvent#operationType
• resource: ResourceType from AdminEvent#resourceType
• error: error from AdminEvent#error, only present for error types

Examples:

keycloak_event_admin_total{error="",operation="CREATE",realm="1fdb3465-1675-49e8-88ad-292e2f42ee72",resource="USER",} 1.0
keycloak_event_admin_total{error="",operation="CREATE",realm="9039a0b5-e8c9-437a-a02e-9d91b04548a4",resource="USER",} 1.0

Configuration

KC_METRICS_EVENT_REPLACE_IDS

Set to true (the default value) than replace model ids from events with names:

• RealmModel#getId() with RealmModel#getName()

Metrics:

keycloak_event_user_total{client="test-client",error="",realm="test-realm",type="LOGIN",} 2.0
keycloak_event_user_total{client="other-client",error="",realm="other-realm",type="LOGIN",} 1.0
keycloak_event_user_total{client="other-client",error="invalid_user_credentials",realm="other-realm",type="LOGIN_ERROR",} 1.0

KC_METRICS_STATS_ENABLED

Set to true (default is false) to provide metrics for user/client count per realm and session count per client. Metrics:

# HELP keycloak_users  
# TYPE keycloak_users gauge
keycloak_users{realm="master",} 1.0
keycloak_users{realm="my-realm",} 2.0
keycloak_users{realm="other-realm",} 1.0# HELP keycloak_active_user_sessions
# TYPE keycloak_active_user_sessions gauge
keycloak_active_user_sessions{client="admin-cli",realm="userCount_1",} 0.0
keycloak_active_user_sessions{client="admin-cli",realm="userCount_2",} 0.0
keycloak_active_user_sessions{client="admin-cli",realm="master",} 1.0
# TYPE keycloak_active_client_sessions gauge
keycloak_active_client_sessions{client="admin-cli",realm="userCount_1",} 0.0
keycloak_active_client_sessions{client="admin-cli",realm="userCount_2",} 0.0
keycloak_active_client_sessions{client="admin-cli",realm="master",} 0.0
# TYPE keycloak_offline_sessions gauge
keycloak_offline_sessions{client="admin-cli",realm="userCount_1",} 0.0
keycloak_offline_sessions{client="admin-cli",realm="userCount_2",} 0.0
keycloak_offline_sessions{client="admin-cli",realm="master",} 0.0

KC_METRICS_STATS_INTERVAL

If KC_METRICS_STATS_ENABLED is true this will define the interval for scraping. If not configured PT60s will be used.

KC_METRICS_STATS_INFO_THRESHOLD and KC_METRICS_STATS_WARN_THRESHOLD

If KC_METRICS_STATS_ENABLED is true this envs will define logging if scraping takes to long. Both envs are parsed as java.lang.Duration.

Default values:

• KC_METRICS_STATS_INFO_THRESHOLD: 50% of KC_METRICS_STATS_INTERVAL = 30s
• KC_METRICS_STATS_WARN_THRESHOLD: 75% of KC_METRICS_STATS_INTERVAL = 45s

If scrapping takes less than KC_METRICS_STATS_INFO_THRESHOLD duration will be logged on debug level.

Installation

Grafana Dashboard

Can be found here: kokuwaio/keycloak keycloak-metrics.json

Testcontainers

For usage in Testcontainers see KeycloakExtension.java

Container Image

Registries:

• ghcr.io/kokuwaio/keycloak-event-metrics
• docker.io/kokuwaio/keycloak-event-metrics

This images are based on busybox, so you can use cp to copy the jar into your keycloak.

Docker

Check: kokuwaio/keycloak

Dockerfile:

###
### download keycloak event metrics
###

FROM debian:stable-slim AS metrics

RUN apt-get -qq update
RUN apt-get -qq install --yes --no-install-recommends ca-certificates wget

ARG METRICS_VERSION=1.0.0
ARG METRICS_FILE=keycloak-event-metrics-${METRICS_VERSION}.jar
ARG METRICS_URL=https://repo1.maven.org/maven2/io/kokuwa/keycloak/keycloak-event-metrics/${METRICS_VERSION}

RUN wget --quiet --no-hsts ${METRICS_URL}/${METRICS_FILE}
RUN wget --quiet --no-hsts ${METRICS_URL}/${METRICS_FILE}.sha1
RUN echo "$(cat ${METRICS_FILE}.sha1) ${METRICS_FILE}" sha1sum --quiet --check --strict -
RUN mkdir -p /opt/keycloak/providers
RUN mv ${METRICS_FILE} /opt/keycloak/providers

###
### build keycloak with metrics
###

FROM quay.io/keycloak/keycloak:25.0.1

ENV KEYCLOAK_ADMIN=admin
ENV KEYCLOAK_ADMIN_PASSWORD=password
ENV KC_HEALTH_ENABLED=true
ENV KC_METRICS_ENABLED=true

COPY --from=metrics /opt/keycloak/providers /opt/keycloak/providers
RUN /opt/keycloak/bin/kc.sh build

Run:

docker build . --tag keycloak:metrics
docker run --rm -p8080 keycloak:metrics start-dev