Create canned issue responses

[brian-brazil]

There's a few common-ish classes of issues that it'd be nice to have canned responses for, and are general enough to do so:

• This is a support question best asked on -users
• Your idea is good, but doesn't make sense within Prometheus
• We're not accepting new SD mechanisms currently

[caniszczyk]

I have some thoughts here, we can try to use a bot to help:

https://probot.github.io/apps/welcome/
https://probot.github.io/apps/support/

All ears on other ideas.

[krasi-georgiev]

@caniszczyk +1 for the support bot.

The vscodebot also has an interesting feature to suggest possible duplicates.
Microsoft/vscode#50466

[RichiH]

Didn't have time to look at the bots yet, but unless they do more than just c&p a snippet, we should avoid those. We have a blurb in the issue & PR templates and if people ignore that one, they will ignore a bot as well.

The initial response should come from a human; a (dumb) bot will never be friendly, or welcoming.

[discordianfish]

👍 💯 I'm really frustrated by Kubernetes' feja bot auto-closing issues and stuff. Nothing says "our time is worth more than yours" than such bot.
A bot is fine but it should only do stuff it was explicitly asked by a human, so might make sense for triaging/tagging etc.

[RichiH]

prometheus/docs#1051

[brian-brazil]

I don't think we can close this just yet, there's still outstanding comments from multiple people on that PR with no consensus.

[krasi-georgiev]

I am 50/50 for auto closing. Yes it is a bit rude , but also serves as a reminder to everyone in the issue to revisit.

The auto closing can be after 90 days and some friendly message