Subscribing to EVENTS published by Broker

giri

Under the reserved topics section of docs - have a question

This is pretty close to tracking lifecycle changes of Broker managed objects as events at runtime, really great.

However, I did not receive any events even with a wild-card subscription '#LOG/>' in 'try-me' tab on the PS+ manager tool.

The doc says - "Subscribed to by management client applications" -

a) What is a management client application - Is it referring to SEMP clients?
b) Is there a way to track QUEUE level events such as client create, destroy, client connection, and disconnection?

himanshu

You need to enable the publishing of broker and/or client events first to be able to get the events. One of my earlier posts shows you how to do it: https://solace.community/discussion/52/subscribing-to-log-messages-in-solace-cloud#latest

Once you start getting the events, this is good documentation to understand the format of the events:
https://docs.solace.com/Solace-PubSub-Event-Reference/event_ref_boiler.html

There are some queue level events that are raised when some thresholds are crossed...which can be configured via the PS+ Manager and there are client level events that are raised when a client connects/disconnects. I am not sure if there are specific events that are published when a client binds and unbinds to a queue.

himanshu

You need to enable the publishing of broker and/or client events first to be able to get the events. One of my earlier posts shows you how to do it: https://solace.community/discussion/52/subscribing-to-log-messages-in-solace-cloud#latest

Once you start getting the events, this is good documentation to understand the format of the events:
https://docs.solace.com/Solace-PubSub-Event-Reference/event_ref_boiler.html

There are some queue level events that are raised when some thresholds are crossed...which can be configured via the PS+ Manager and there are client level events that are raised when a client connects/disconnects. I am not sure if there are specific events that are published when a client binds and unbinds to a queue.

TomF

Hi @giri, the idea here is you're using a message client to consume management events - say another client connecting. These management events will be generated by messaging clients - say by connecting - or management (SEMP) clients for instance creating a queue. Here's the event I got when I created a queue using the CLI:

Destination: Topic '#LOG/NOTICE/VPN/d2ca1b9816af/VPN_AD_QENDPT_CREATE/default'
...
32 30 32 31 2d 30 37 2d 32 38 54 31 34 3a 30 32 2021-07-28T14:02
3a 30 30 2e 35 39 34 2b 30 30 3a 30 30 20 4e 4f :00.594+00:00.NO
54 49 43 45 20 64 32 63 61 31 62 39 38 31 36 61 TICE.d2ca1b9816a
66 20 56 50 4e 3a 20 56 50 4e 5f 41 44 5f 51 45 f.VPN:.VPN_AD_QE
4e 44 50 54 5f 43 52 45 41 54 45 3a 20 64 65 66 NDPT_CREATE:.def
61 75 6c 74 20 2d 20 4d 65 73 73 61 67 65 20 56 ault.-.Message.V
50 4e 20 28 30 29 20 51 75 65 75 65 20 61 2d 74 PN.(0).Queue.a-t
65 73 74 20 63 72 65 61 74 65 64 00 est.created.

The key is you have to enable these events for the Message VPN. In PubSub+ Broker Manager, go to the Message VPN settings tab, then open Advanced Settings. Towards the end of the page you'll see "Event Configuration." Enable those:

nram

Hello @giri , for a) Do you have these settings turned on for the VPN? These are turned off by default.

nram

b) If you have Publish Client Events enabled, you will receive all client related events such as connect, disconnect, flow create, destroy,.

giri

Thank you @himanshu @TomF and @nram. Very good pointers and references 🙏

I will try to build a small program around this to understand the inner workings sometime soon. Thx!!