Add ability to ship logs to a Slack channel

This lets you ship logs of a specified level or even granular via Elixir metadata to Slack channel(s). Extremely convenient to permit devs or admins to easily view logs without needing a shell or access to private resources behind a VPN, etc.

added 1 commit

• 1b91784c - Clarify log module in docs

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resolved all discussions

resolved all discussions

added 22 commits

• 1b91784c...3f8be270 - 21 commits from branch pleroma:develop
• 1bfeded0 - Merge branch 'develop' into feature/quack

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merged

mentioned in commit 9c9eec62