Add support for graphing multiple unrelated timeseries (metrics) in one graph

[juliusv]

It should be possible to correlate multiple metrics in the same graph. The graphing UI should show (dynamically) multiple expression input fields to enable that.

[brian-brazil]

The console templates graph library supports this, we'd have to hook it into /graph though.

[syepes]

+1

[smalot]

+1

[fmmr]

+1

[prasadus92]

+1

[alexellis]

~3 years on are we any closer to this happening? @brian-brazil

[juliusv]

@alexellis No, nobody has spent time on this yet as far as I know.

[mindfulmonk]

What about this query? It seems to work.

{__name__=~"node_filefd_allocated|node_filefd_maximum"}

[juliusv]

@mindfulmonk That works, but has the downside of giving you back all data in one expression, and especially if you apply any transformation that will drop the metric name (rate, increase, sum, avg, etc.), then you won't know anymore what is what.

[tomwilkie]

@davkal added a hack to the Cortex UI to allow multiple queries separated by semicolons. @juliusv do you think that might work here?

…

On Wed, 31 May 2017 at 15:50, Julius Volz ***@***.***> wrote: @mindfulmonk <https://github.com/mindfulmonk> That works, but has the downside of giving you back all data in one expression, and especially if you apply any transformation that will drop the metric name (rate, increase, sum, avg, etc.), then you won't know anymore what is what. — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#39 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAbGhQXG3gRkgAMhL3izXj6lIgc9zZJXks5r_X4lgaJpZM4AYIZW> .

[juliusv]

That really seems hacky to me (and could theoretically even conflict with future language changes). If we decide to do this in Prometheus itself at all, I'd prefer a full UI solution to this that allows you to add multiple input fields - either underneath each other or tabbed (like in OpenTSDB).

[G-Harmon]

+1 to this request

[davkal]

This is supported by Grafana's Explore, which is now available in grafana/grafana:latest as part of the Beta for the upcoming 6.0 release (and no longer behind a feature flag).

[codesome]

I was digging through issues for possible GSoC projects, so are we still keen on adding this into Prometheus?
/cc @juliusv

[juliusv]

I think yes, but it's probably not large enough for a GSoC project. Maybe a day or so...