Monitoring JetStream
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JetStream has a /HTTP endpoint and advisories available.
JetStream publishes a number of advisories that can inform operations about the health and the state of the Streams. These advisories are published to normal NATS subjects below $JS.EVENT.ADVISORY.> and one can store these advisories in JetStream Streams if desired.
The command nats event --js-advisory can view all these events on your console. The Golang package can consume and render these events and have data types for each of these events.
All these events have JSON Schemas that describe them, schemas can be viewed on the CLI using the nats schema show <schema kind> command.
API interactions
$JS.EVENT.ADVISORY.API
io.nats.jetstream.advisory.v1.api_audit
Stream CRUD operations
$JS.EVENT.ADVISORY.STREAM.CREATED.<STREAM>
io.nats.jetstream.advisory.v1.stream_action
Consumer CRUD operations
$JS.EVENT.ADVISORY.CONSUMER.CREATED.<STREAM>.<CONSUMER>
io.nats.jetstream.advisory.v1.consumer_action
Snapshot started using nats stream backup
$JS.EVENT.ADVISORY.STREAM.SNAPSHOT_CREATE.<STREAM>
io.nats.jetstream.advisory.v1.snapshot_create
Snapshot completed
$JS.EVENT.ADVISORY.STREAM.SNAPSHOT_COMPLETE.<STREAM>
io.nats.jetstream.advisory.v1.snapshot_complete
Restore started using nats stream restore
$JS.EVENT.ADVISORY.STREAM.RESTORE_CREATE.<STREAM>
io.nats.jetstream.advisory.v1.restore_create
Restore completed
$JS.EVENT.ADVISORY.STREAM.RESTORE_COMPLETE.<STREAM>
io.nats.jetstream.advisory.v1.restore_complete
Consumer maximum delivery reached
$JS.EVENT.ADVISORY.CONSUMER.MAX_DELIVERIES.<STREAM>.<CONSUMER>
io.nats.jetstream.advisory.v1.max_deliver
Message delivery naked using AckNak
$JS.EVENT.ADVISORY.CONSUMER.MSG_NAKED.<STREAM>.<CONSUMER>
io.nats.jetstream.advisory.v1.nak
Message delivery terminated using AckTerm
$JS.EVENT.ADVISORY.CONSUMER.MSG_TERMINATED.<STREAM>.<CONSUMER>
io.nats.jetstream.advisory.v1.terminated
Message acknowledged in a sampled Consumer
$JS.EVENT.METRIC.CONSUMER.ACK.<STREAM>.<CONSUMER>
io.nats.jetstream.metric.v1.consumer_ack
Clustered Stream elected a new leader
$JS.EVENT.ADVISORY.STREAM.LEADER_ELECTED.<STREAM>
io.nats.jetstream.advisory.v1.stream_leader_elected
Clustered Stream lost quorum
$JS.EVENT.ADVISORY.STREAM.QUORUM_LOST.<STREAM>
io.nats.jetstream.advisory.v1.stream_quorum_lost
Clustered Consumer elected a new leader
$JS.EVENT.ADVISORY.CONSUMER.LEADER_ELECTED.<STREAM>.<CONSUMER>
io.nats.jetstream.advisory.v1.consumer_leader_elected
Clustered Consumer lost quorum
$JS.EVENT.ADVISORY.CONSUMER.QUORUM_LOST.<STREAM>.<CONSUMER>
io.nats.jetstream.advisory.v1.consumer_quorum_lost
The system has initial support for passing JetStream metrics to Prometheus, dashboards and more will be added towards final release.