feat: add support for loki

[FUSAKLA]

/resolves #69

Adds support for validating of loki rules
and adds two new validations for LogQL expressions

• isValidLoqQLExpression
• logQlExpressionUesesRangeAggreagationn

Also adds some documentation, e2e tests for loki etc

Signed-off-by: Martin Chodur m.chodur@seznam.cz

[FUSAKLA]

PTAL @jmichalek132 if it makes sense to you and possibly what checks would you like to see for loki so I can say if this is the way how to approach it

[jmichalek132]

PTAL @jmichalek132 if it makes sense to you and possibly what checks would you like to see for loki so I can say if this is the way how to approach it

This looks good to me, we are just starting to use loki internally within our team, so for now the generic validations + the query being valid and the yaml unmarshalling are the most important ones.
Down the line when we onboard other teams to use it I can imagine an useful validation outside of the generic ones could be for e.g. validating than the remote write config is not specified (I am not 100% sure, but I assume when it is it takes precedence over the configuration to the loki ruler itself which we might not want to allow).

Thank you for doing this :).

[FUSAKLA]

Great 🎉

I'l merge it and would love some feedback if you could give it a try.

If merged you should be able to install it using the go install

[jmichalek132]

Great 🎉

I'l merge it and would love some feedback if you could give it a try.

If merged you should be able to install it using the go install

I will on Monday :).

[jmichalek132]

Great 🎉
I'l merge it and would love some feedback if you could give it a try.
If merged you should be able to install it using the go install

I will on Monday :).

Tested today, it works nicely ;) looking forward to a release :).