metrics are served in json by default

[532910]

metris are served in json by default:

# curl localhost:8080/metrics
{"endpoints_with_suspended_sources":0,"srtp_send_queue_excepti...

[bgrozev]

Thank you for the report! It looks like the default format we return (when no Accept header is set) is not set deterministically. I get different behavior after restarting the JVM, it probably has to do with the order in which the annotations are processed.

I don't think it's a regression, as I can repro after restarting with 2.3.160 as well. To get consistent behavior add an "Accept" header like described here:
https://github.com/jitsi/jitsi-videobridge/blob/master/doc/statistics.md#prometheus

This behavior is bad and I'll fix it, but I'm not sure what default to go with. In jibri we use JSON as a default, and I'd like to keep it consistent between projects.

[532910]

it's my fault, not a regression, sorry ):