Endpoints
The following sections describe each supported monitoring endpoint: serverz, storez, clientsz, and channelsz.
The endpoint http://localhost:8222/streaming/serverz reports various general statistics.
{"cluster_id": "test-cluster","server_id": "h5MPY4SfSbqRnyk7Omgr35","version": "0.17.0","go": "go1.13.7","state": "STANDALONE","now": "2020-02-11T16:17:33.101243-07:00","start_time": "2020-02-11T16:17:15.323466-07:00","uptime": "17s","clients": 0,"subscriptions": 0,"channels": 0,"total_msgs": 0,"total_bytes": 0,"in_msgs": 0,"in_bytes": 0,"out_msgs": 0,"out_bytes": 0}
In clustering mode, there is an additional field that indicates the RAFT role of the given node. Here is an example:
{"cluster_id": "test-cluster","server_id": "UaHeX4HdFN57e63ULcifHQ","version": "0.17.0","go": "go1.13.7","state": "CLUSTERED","role": "Leader","now": "2020-02-11T16:19:30.761192-07:00","start_time": "2020-02-11T16:19:24.777221-07:00","uptime": "5s","clients": 0,"subscriptions": 0,"channels": 0,"total_msgs": 0,"total_bytes": 0,"in_msgs": 0,"in_bytes": 0,"out_msgs": 0,"out_bytes": 0}
The possible values are: Leader, Follower or Candidate.
The endpoint http://localhost:8222/streaming/storez reports information about the store.
{"cluster_id": "test-cluster","server_id": "8AjZq57k4JY7cfKEvuZ8iF","now": "2019-04-16T09:57:32.857406-06:00","type": "MEMORY","limits": {"max_channels": 100,"max_msgs": 1000000,"max_bytes": 1024000000,"max_age": 0,"max_subscriptions": 1000,"max_inactivity": 0},"total_msgs": 130691,"total_bytes": 19587140}
The endpoint http://localhost:8222/streaming/clientsz reports more detailed information about the connected clients.
It uses a paging mechanism which defaults to 1024 clients.
You can control these via URL arguments (limit and offset). For example: http://localhost:8222/streaming/clientsz?limit=1&offset=1.
{"cluster_id": "test-cluster","server_id": "J3Odi0wXYKWKFWz5D5uhH9","now": "2017-06-07T14:47:44.495254605+02:00","offset": 1,"limit": 1,"count": 1,"total": 11,"clients": [{"id": "benchmark-sub-0","hb_inbox": "_INBOX.jAHSY3hcL5EGFQGYmfayQK"}]}
You can also report detailed subscription information on a per client basis using subs=1. For example: http://localhost:8222/streaming/clientsz?limit=1&offset=1&subs=1.
{"cluster_id": "test-cluster","server_id": "J3Odi0wXYKWKFWz5D5uhH9","now": "2017-06-07T14:48:06.157468748+02:00","offset": 1,"limit": 1,"count": 1,"total": 11,"clients": [{"id": "benchmark-sub-0","hb_inbox": "_INBOX.jAHSY3hcL5EGFQGYmfayQK","subscriptions": {"foo": [{"client_id": "benchmark-sub-0","inbox": "_INBOX.jAHSY3hcL5EGFQGYmfayvC","ack_inbox": "_INBOX.J3Odi0wXYKWKFWz5D5uhem","is_durable": false,"is_offline": false,"max_inflight": 1024,"ack_wait": 30,"last_sent": 505597,"pending_count": 0,"is_stalled": false}]}}]}
You can select a specific client based on its client ID with client=<id>, and get also get detailed statistics with subs=1. For example: http://localhost:8222/streaming/clientsz?client=me&subs=1.
{"id": "me","hb_inbox": "_INBOX.HG0uDuNtAPxJQ1lVjIC2sr","subscriptions": {"foo": [{"client_id": "me","inbox": "_INBOX.HG0uDuNtAPxJQ1lVjIC389","ack_inbox": "_INBOX.Q9iH2gsDPN57ZEvqswiYSL","is_durable": false,"is_offline": false,"max_inflight": 1024,"ack_wait": 30,"last_sent": 0,"pending_count": 0,"is_stalled": false}]}}
The endpoint http://localhost:8222/streaming/channelsz reports the list of channels.
{"cluster_id": "test-cluster","server_id": "J3Odi0wXYKWKFWz5D5uhH9","now": "2017-06-07T14:48:41.680592041+02:00","offset": 0,"limit": 1024,"count": 2,"total": 2,"names": ["bar""foo"]}
It uses a paging mechanism which defaults to 1024 channels.
You can control these via URL arguments (limit and offset). For example: http://localhost:8222/streaming/channelsz?limit=1&offset=1.
{"cluster_id": "test-cluster","server_id": "J3Odi0wXYKWKFWz5D5uhH9","now": "2017-06-07T14:48:41.680592041+02:00","offset": 1,"limit": 1,"count": 1,"total": 2,"names": ["foo"]}
You can also get the list of subscriptions with subs=1. For example: http://localhost:8222/streaming/channelsz?limit=1&offset=0&subs=1.
{"cluster_id": "test-cluster","server_id": "J3Odi0wXYKWKFWz5D5uhH9","now": "2017-06-07T15:01:02.166116959+02:00","offset": 0,"limit": 1,"count": 1,"total": 2,"channels": [{"name": "bar","msgs": 0,"bytes": 0,"first_seq": 0,"last_seq": 0,"subscriptions": [{"client_id": "me","inbox": "_INBOX.S7kTJjOcToXiJAzGWgINit","ack_inbox": "_INBOX.Y04G5pZxlint3yPXrSTjTV","is_durable": false,"is_offline": false,"max_inflight": 1024,"ack_wait": 30,"last_sent": 0,"pending_count": 0,"is_stalled": false}]}]}
You can select a specific channel based on its name with channel=name. For example: http://localhost:8222/streaming/channelsz?channel=foo.
{"name": "foo","msgs": 649234,"bytes": 97368590,"first_seq": 1,"last_seq": 649234}
And again, you can get detailed subscriptions with subs=1. For example: http://localhost:8222/streaming/channelsz?channel=foo&subs=1.
{"name": "foo","msgs": 704770,"bytes": 105698990,"first_seq": 1,"last_seq": 704770,"subscriptions": [{"client_id": "me","inbox": "_INBOX.jAHSY3hcL5EGFQGYmfayvC","ack_inbox": "_INBOX.J3Odi0wXYKWKFWz5D5uhem","is_durable": false,"is_offline": false,"max_inflight": 1024,"ack_wait": 30,"last_sent": 704770,"pending_count": 0,"is_stalled": false},{"client_id": "me2","inbox": "_INBOX.jAHSY3hcL5EGFQGYmfaywG","ack_inbox": "_INBOX.J3Odi0wXYKWKFWz5D5uhjV","is_durable": false,"is_offline": false,"max_inflight": 1024,"ack_wait": 30,"last_sent": 704770,"pending_count": 0,"is_stalled": false},(...)]}
For durables that are currently running, the is_offline field is set to false. Here is an example:
{"name": "foo","msgs": 0,"bytes": 0,"first_seq": 0,"last_seq": 0,"subscriptions": [{"client_id": "me","inbox": "_INBOX.P23kNGFnwC7KRg3jIMB3IL","ack_inbox": "_STAN.ack.pLyMpEyg7dgGZBS7jGXC02.foo.pLyMpEyg7dgGZBS7jGXCaw","durable_name": "dur","is_durable": true,"is_offline": false,"max_inflight": 1024,"ack_wait": 30,"last_sent": 0,"pending_count": 0,"is_stalled": false}]}
When that same durable goes offline, is_offline is be set to true. Although the client is possibly no longer connected (and would not appear in the clientsz endpoint), the client_id field is still displayed here.
{"name": "foo","msgs": 0,"bytes": 0,"first_seq": 0,"last_seq": 0,"subscriptions": [{"client_id": "me","inbox": "_INBOX.P23kNGFnwC7KRg3jIMB3IL","ack_inbox": "_STAN.ack.pLyMpEyg7dgGZBS7jGXC02.foo.pLyMpEyg7dgGZBS7jGXCaw","durable_name": "dur","is_durable": true,"is_offline": true,"max_inflight": 1024,"ack_wait": 30,"last_sent": 0,"pending_count": 0,"is_stalled": false}]}
The endpoint http://localhost:8222/streaming/isFTActive indicates, through the HTTP response code, if this server is running as the active server of a fault tolerant (FT) group. If the server is the active server, the HTTP response code returned is 200, otherwise 204 (which indicates either that the server is running as a FT standby server, or simply not running in FT mode).
If the server is FT active:
curl -i http://localhost:8222/streaming/isFTActiveHTTP/1.1 200 OKDate: Wed, 24 Jun 2020 14:44:24 GMTContent-Length: 0
If not:
curl -i http://localhost:8222/streaming/isFTActiveHTTP/1.1 204 No ContentDate: Wed, 24 Jun 2020 14:44:37 GMT
