Maximum amount of connections to a single VM

[mayailurus]

Hm… As a few quick pointers, to previous, similar discussions that came to mind… There were reports earlier of the Grafana App Concurrency stats not actually matching the Machine’s own internal count of active WebSockets:

@dudz

For instance, there is 12–15 people using the websocket on the last minutes and suddenly the “Concurrency” drops to 0. We know the machine is still running by looking on the other metrics and we also know that Websocket users are connected because we are monitoring via our own monitoring system

And the following general caveat was mentioned elsewhere:

@charsleysa

The app concurrency metric isn’t the best for seeing how requests are distributed across machines.

The metric only shows how many requests are currently being processed at the time the metric is collected. That means if the machine happens to be processing no requests during the split second that the metric is being collected, it will report 0 even if it was processing 1000 requests a split second ago.

(That second one was written in the context of type = "requests", but the overall comment and thread is food for thought.)

It’s not a solution, per se, but hope these still help a little!

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Aside: You might also want to check ulimit -H -n (the hard limit on the number of open file descriptors).

$ fly ssh console -C 'bash -c "ulimit -H -n"'
10240

This is an OS-level limit (i.e., Linux’s doing).