How to access Prometheus metrics from Gateway

The Prometheus endpoint is <gateway_host>:<gateway_port>/metrics , for example;

localhost:8888/metrics

Please note that if you enabled GATEWAY_SECURED_METRICS you will need to access it with credentials, for example;

--username "admin:conduktor" localhost:8888/metrics

Available metrics for Prometheus

Metric description	Metric value
The number of connections closed per second	gateway.upstream.connection_close_rate
The total number of connections closed	gateway.upstream.connection_close_total
The number of new connections established per second	gateway.upstream.connection_creation_rate
The total number of new connections established	gateway.upstream.connection_creation_total
The number of times the I/O layer checked for new I/O to perform per second	gateway.upstream.select_rate
The total number of times the I/O layer checked for new I/O to perform	gateway.upstream.select_total
The number of time the I/O thread spent waiting	gateway.upstream.io_wait_rate
The total time the I/O thread spent waiting	gateway.upstream.io_wait_total
The number of active broker connections of the connection pool	gateway.brokered_active_connections
The number of active connections per vcluster	gateway.active_connections.vcluster
The latency to process a request and generate a response	gateway.latency.request_response
The latency to process a request and generate a response for each ApiKey	gateway.apiKeys.latency.request_response
The total number of bytes exchanged through the gateway	gateway.bytes_exchanged
The total bytes exchanged within the context of the specified virtual cluster	gateway.bytes_exchanged.vcluster
A counter on number of rebuilding kafka request	gateway.thread.request.rebuild
The number of pending tasks on our Gateway thread (where all rebuilding request/response happen)	gateway.thread.tasks
The number of connections from Gateway to the backing Kafka cluster	gateway.upstream.connections.upstream.connected
The number of connections from clients to Gateway	gateway.upstream.connections.downstream
The number of Kafka nodes	gateway.upstream.io.nodes
The size of the kcache (equal to the number of key-value pairs we have in the cache)	gateway.kcache_size
The number of active backend brokers	gateway.backend.brokered_active_connections
The number of authentication attempts that failed for each user	gateway.failed_authentications
The log end offset of client topics	gateway.topic.log_end_offset
The current offset of consumer group on client topic	gateway.topic.current_offset