# Group Coordinator Metrics This topic describes JMX metrics for the Kafka group coordinator. These metrics are useful for monitoring consumer group management in your Kafka cluster. For information about how to configure JMX, see [Configure JMX for Monitoring](configure-jmx.md#configure-jmx). ## Search for a metric

The following metrics are available for monitoring the group coordinator. ### batch-flush-rate MBean: `kafka.server:type=group-coordinator-metrics,name=batch-flush-rate` : The number of batches flushed per second. ### batch-flush-time-ms MBean: `kafka.server:type=group-coordinator-metrics,name=batch-flush-time-ms-[max|p50|p95|p99|p999]` : The time that a batch took to be flushed to the local partition. ### batch-linger-time-ms MBean: `kafka.server:type=group-coordinator-metrics,name=batch-linger-time-ms-[max|p50|p95|p99|p999]` : The effective linger time of a batch before being flushed. ### consumer-group-count MBean: `kafka.server:type=group-coordinator-metrics,name=consumer-group-count,state=[empty|assigning|reconciling|stable|dead]` : Total number of consumer groups in each state. Possible states can be `Empty`, `Assigning`, `Reconciling`, `Stable`, or `Dead`. ### consumer-group-rebalance-count MBean: `kafka.server:type=group-coordinator-metrics,name=consumer-group-rebalance-count` : Total number of consumer group rebalances. ### consumer-group-rebalance-rate MBean: `kafka.server:type=group-coordinator-metrics,name=consumer-group-rebalance-rate` : The rebalance rate of consumer groups. ### event-processing-time-ms MBean: `kafka.server:type=group-coordinator-metrics,name=event-processing-time-ms-[max|p50|p95|p99|p999]` : The time that an event took to be processed. ### event-purgatory-time-ms MBean: `kafka.server:type=group-coordinator-metrics,name=event-purgatory-time-ms-[max|p50|p95|p99|p999]` : The time that an event waited in the purgatory before being completed. ### event-queue-size MBean: `kafka.server:type=group-coordinator-metrics,name=event-queue-size` : The number of events waiting to be processed in the queue. ### event-queue-time-ms MBean: `kafka.server:type=group-coordinator-metrics,name=event-queue-time-ms-[max|p50|p95|p99|p999]` : The time that an event spent waiting in the queue to be processed. ### group-completed-rebalance-count MBean: `kafka.server:type=group-coordinator-metrics,name=group-completed-rebalance-count` : The total number of classic group completed rebalances. ### group-completed-rebalance-rate MBean: `kafka.server:type=group-coordinator-metrics,name=group-completed-rebalance-rate` : The rate of classic group completed rebalances. ### group-count MBean: `kafka.server:type=group-coordinator-metrics,name=group-count,protocol={consumer|classic|streams}` : The total number of groups per group type. Possible types are `Classic`, `Consumer`, or `Streams`. ### NumGroups (Classic) MBean: `kafka.server:type=GroupMetadataManager,name=NumGroups` : Total number of Classic Groups. ### NumGroups by state (Classic) MBean: `kafka.server:type=GroupMetadataManager,name=NumGroups[PreparingRebalance,CompletingRebalance,Empty,Stable,Dead]` : The number of Classic Groups in each state. Possible states can be `PreparingRebalance`, `CompletingRebalance`, `Empty`, `Stable`, or `Dead`. ### NumOffsets MBean: `kafka.server:type=GroupMetadataManager,name=NumOffsets` : Total number of committed offsets for classic and consumer groups. ### offset-commit-count MBean: `kafka.server:type=group-coordinator-metrics,name=offset-commit-count` : The total number of committed offsets. ### offset-commit-rate MBean: `kafka.server:type=group-coordinator-metrics,name=offset-commit-rate` : The rate of committed offsets. ### offset-deletion-count MBean: `kafka.server:type=group-coordinator-metrics,name=offset-deletion-count` : The total number of administrative deleted offsets. ### offset-deletion-rate MBean: `kafka.server:type=group-coordinator-metrics,name=offset-deletion-rate` : The rate of administrative deleted offsets. ### offset-expiration-count MBean: `kafka.server:type=group-coordinator-metrics,name=offset-expiration-count` : The total number of expired offsets. ### offset-expiration-rate MBean: `kafka.server:type=group-coordinator-metrics,name=offset-expiration-rate` : The rate of expired offsets. ### Partition count by state MBean: `kafka.server:type=group-coordinator-metrics,name=num-partitions,state={loading|active|failed}` : The number of `__consumer_offsets` partitions hosted by the broker, broken down by state. Possible states can be `loading`, `active`, or `failed`. ### partition-load-time-avg MBean: `kafka.server:type=group-coordinator-metrics,name=partition-load-time-avg` : The average loading time needed to read the state from the `__consumer_offsets` partitions. ### partition-load-time-max MBean: `kafka.server:type=group-coordinator-metrics,name=partition-load-time-max` : The maximum loading time needed to read the state from the `__consumer_offsets` partitions. ### thread-idle-ratio-avg MBean: `kafka.server:type=group-coordinator-metrics,name=thread-idle-ratio-avg` : The average idle ratio of the coordinator threads. ## Related content - [Monitor Kafka with JMX in Confluent Platform](monitoring.md#kafka-monitoring) - [Configure JMX for Monitoring](configure-jmx.md#configure-jmx) - [Broker and Controller Metrics](broker-metrics.md#broker-metrics) - [Log and Network Metrics](log-network-metrics.md#log-network-metrics) - [Consumer Metrics](consumer-metrics.md#consumer-metrics) - [Producer Metrics](producer-metrics.md#producer-metrics) - [Security Metrics](security-metrics.md#security-metrics)