Add alertmanager alerts.yaml

[hollanbm]

Big fan of this project, and your other exporters.

I wanted to give back, so I'm sharing one of the rules I have setup for alertmanager as an example.

Thanks!

[pchang388]

hey @hollanbm, thanks for very for your contribution!

Let me take a look and see then push it on through

[pchang388]

There are some cases where Tdarr may fail/error the transcode and it is still acceptable (i.e. plugin doesn't work with file type well, etc.). In those cases the error number will always be non zero (since its a running count from Tdarr). In this case, it may be better to use a rate + sum function in the query and reduce the threshold time. This would allow for those with that use case to be fine and still be alerted if there's an increase in error transcodes.

Something like this as the query I'm thinking:

sum(rate(tdarr_library_transcodes{status="error"}[5m])) by (tdarr_instance) > 0

Although this isn't perfect either, I'm thinking it may auto resolve (depending on config) after the error period (in the rate) has passed but at least the alert is sent out for the user to be aware

[hollanbm]

There are some cases where Tdarr may fail/error the transcode and it is still acceptable (i.e. plugin doesn't work with file type well, etc.). In those cases the error number will always be non zero (since its a running count from Tdarr). In this case, it may be better to use a rate + sum function in the query and reduce the threshold time. This would allow for those with that use case to be fine and still be alerted if there's an increase in error transcodes.

Something like this as the query I'm thinking:

sum(rate(tdarr_library_transcodes{status="error"}[5m])) by (tdarr_instance) > 0

Although this isn't perfect either, I'm thinking it may auto resolve (depending on config) after the error period (in the rate) has passed but at least the alert is sent out for the user to be aware

Since this is just documentation and examples, we could add both, and an explanation :)

[pchang388]

@hollanbm you're right definitely can do that - was just thinking out loud hah. Thank you again for the contribution! Pushing this through