promql+alert_generator: Dockerized the toolset, updated docs.

[bwplotka]

Additionally updated docs.

The motivation for this is that we can now set automated tests where in future we might want to provide docker images with exact set of test cases in versioned image.

Signed-off-by: Bartlomiej Plotka bwplotka@gmail.com

[bwplotka]

I guess one idea is to move some (non SaaS) e2e tests to here directly (similar to thanos-io/thanos#4781) - it's portable, docker based so should be working fine, like we do for agent's remote write send tests.

[juliusv]

Thanks! Hmmm, I already have a local change that I didn't manage to push yet out of time constraints this week that just allows you to repeat the -config-file flag, which leads to simply concatenating config files before YAML parsing. That allows for even more general config splitting, what do you think? I wanted to just push it now.

[bwplotka]

Is it for the same reason?

If yes than I would say separate specific ones might be more clear.

If there is another reason, let's go with a repeated one, it will do the work too. I can rebase later on 👍🏽

[juliusv]

See comments in #48 (comment), will review this PR again after rebase :)

[juliusv]

@bwplotka Do you still want to update / rebase this PR? (either keeping your way of doing configs or mine)

[GiedriusS]

@bwplotka any update on this?

[bwplotka]

Sorry, I don't follow GH notifications... and I need this PR again for dockerizing alerting compliance too ;p Let me rebase and try again!

[bwplotka]

Updated, PTAL @juliusv @GiedriusS and @codesome (:

See working example: thanos-io/thanos#5315

[juliusv]

Just sprinkling some articles and stuff like that onto my part of the code base ;)

[codesome]

LGTM for the alert_generator addition. Thanks!

[bwplotka]

Thanks! Addressed (: