Adding rulebook_url also affects external alerts

[serathius]

Automatic rulebook_url generation runs as mixin without any condition.
So when vendoring kubernetes-mixin, my own alerts are also affected by this.

[tomwilkie]

Hi @serathius! Thanks for the report. Can confirm this is not the intention - I was under the impression the merge ordering would fix this but looks like we've got the same problem. I'll give it some thought.

[serathius]

Your right, my lack of jsonnet knowledge here. Order is important here.
Maybe example in README would help?

[tomwilkie]

Sorry my comment was not clear: I was under the impression the merge ordering was important, but we have the same problem, and we're merging in the "right" order. So it looks like merge ordering isn't important. I need to do some more investigation.

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