Support Grafana v9.x messages, fixes #29

[svenseeberg]

This PR adds support for Grafana v9.x style alert messages by adding a new formatter. If the old formatter detects that the JSON was emitted by a version 9 Grafana, it automatically uses the newer formatter. Additionally, an example JSON is provided.

Much nicer instead of replacing new line characters would be parsing the JSON attributes and creating a nice formatted markdown message. That could be a feature in the future.

Fixes #29

[svenseeberg]

I can see that there are some CI tests. Awesome, I will update the PR to fix the issues.

[codecov-commenter]

Codecov Report

Merging #45 (e139c3a) into master (3288c3f) will increase coverage by 0.32%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #45      +/-   ##
==========================================
+ Coverage   93.61%   93.93%   +0.32%     
==========================================
  Files           6        6              
  Lines         188      198      +10     
==========================================
+ Hits          176      186      +10     
  Misses         12       12              

Impacted Files	Coverage Δ
matrix_webhook/formatters.py	100.00% <100.00%> (ø)

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

[svenseeberg]

@nim65s I guess that my forked repo PR does not have access to the API key in the environment?

[nim65s]

@svenseeberg the issue here is that in grafana 9x, there is a key in the JSON, and that one takes precedence over the key GET parameter. I guess we can configure grafana 9x hooks with a key, and that's exactly what matrix-webhook is looking for.

So you can remove "key": KEY from the python test file, and the associated KEY import, and instead put the right key in the json file.

This key is not a real secret configured in this github repositiory: it is ak, according to the tests/.env file. Otherwise you couldn't run the tests locally with docker-compose -f test.yml up --exit-code-from tests --force-recreate --build :)

[nim65s]

Perfect, thanks !