@ServerWebsocket annotation results in too many metrics and out of memory conditions

[joelezellLP]

Steps to Reproduce

1. Create a class with an annotation similar to this: @ServerWebSocket("/media/v1/conversation/{conversationId}/websocket") and appropriately annotated @onopen and @OnMessage methods.
2. Open websockets to this service with different values for conversationId
3. Check the metrics scrape endpoint.

Expected Behaviour

I think that duration of websocket sessions doesn't make sense as a metric, especially not compared with regular http requests. I originally thought there should be a single pair of metrics as below because parameterized websocket controller paths should be treated like http parameterized controller paths. I now think websocket endpoints simply shouldn't have these metrics.

http_server_requests_seconds_count{exception="none",method="POST",status="200",uri="/media/v1/conversation/{conversationId}/websocket",} 3.0
http_server_requests_seconds_sum{exception="none",method="POST",status="200",uri="/media/v1/conversation/{conversationId}/websocket",} 0.56403263

Actual Behaviour

There are multiple pairs of metrics like this:
http_server_requests_seconds_count{exception="none",method="POST",status="200",uri="/media/v1/conversation/ID-1/websocket",} 3.0
http_server_requests_seconds_sum{exception="none",method="POST",status="200",uri="/media/v1/conversation/ID-1/websocket",} 0.56403263
http_server_requests_seconds_count{exception="none",method="POST",status="200",uri="/media/v1/conversation/ID-2/websocket",} 3.0
http_server_requests_seconds_sum{exception="none",method="POST",status="200",uri="/media/v1/conversation/ID-2} 0.56403263

Over time this results in us running out of memory.

** I have worked around the problem by setting the micronaut.metrics.http.path property to a path that excludes my websocket endpoint. **

Environment Information

• Micronaut Version: 3.7.1
• Micrometer Version: 4.6.1

Additional Information

https://github.com/micronaut-projects/micronaut-micrometer/tree/master/micrometer-core/src/main/java/io/micronaut/configuration/metrics/binder/web

I think you may need a WebsocketRequestMeterRegistryFilter like you have for client and server.