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Fix Redis missing master query

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The previous approach fails because of the "missing data" semantics in Prometheus. If the Redis server is down, PromQL will typically return "no data" instead of 0 for a `count()`; this is by design in Prometheus.

This suggestion as given by @slovdahl works around this by returning an vector with a single `0` entry in this case, making the query work as intended.
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Per Lundberg 2020-11-25 16:06:05 +02:00 committed by GitHub
parent 2186841f29
commit 00dd58eace
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_data/rules.yml
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@ -520,7 +520,7 @@ groups:
severity: critical
- name: Redis missing master
description: Redis cluster has no node marked as master.
query: 'count(redis_instance_info{role="master"}) == 0'
query: 'count(redis_instance_info{role="master"}) or vector(0) < 1'
severity: critical
- name: Redis too many masters
description: Redis cluster has too many nodes marked as master.