Ruby VM memory usage metrics

[dan-corneanu]

Hello,
I have set up a docker swarm solution in which I have

• a rails application instrumented with OpenTelemetry
• otel-collector
• Jaeger to capture and store traces
• Prometheus to capture and store metrics
• Grafana to visualise the metrics and query the traces

I am very happy with the solution so far. I have a dashboard that shows me the request latency, request rate per minute and error rate per minute. I have also set up the hostmetrics receiver on the collector so I also get information about the memory usage on each of my nodes.

However, what I am missing is memory usage statistics for the individual Ruby VMs.

Do you have any suggestions on what I could use to generate per VM memory usage metrics?

[arielvalentin]

@dan-corneanu I assume you are looking for metrics like Old/New Gen sizes, GC, Object allocations, etc...

Unfortunately, the Metrics SDK is still a WIP so you will likely need a vendor specific solution to capture these runtime metrics.

[dan-corneanu]

Yes, that is correct. I was able to get memory metrics for Ruby processes using the hostmetrics receiver. That works well but I thought it would be nice to also get detailed metrics about the Ruby VM.