I'm trying to use the following formula for a stats panel display in grafana
pg_up{cluster="[[pgcluster]]"} /
(ccp_is_in_recovery_status{cluster="[[pgcluster]]"})
This can return multiple values if there are multiple clusters, which is
expected. However if one of the clusters goes down, the right hand side
metric goes away completely while the left side just changes from 1 to 0.
As it's written above, that makes the metric completely disappear which is
not what I want because then the panel completely goes away in Grafana vs
being able to show a "down" status.
I've been trying to see about how to handle the right side going null but
still returning a value. I found the vector(0) trick, but it still doesn't
work as expected. For example, for a single cluster:
pg_up{cluster="alpha"} / ccp_is_in_recovery_status{cluster="alpha"} OR
vector(0)
If all nodes are up, it still always returns an extra vector(0) in addition
to the normal node values. And if more than one node is down, it only
returns one empty value vs having multiples returned.
So, basically I'm just trying to have a default value for the right hand
side if that expression happens to go null. Or I guess the more general
question is how do you allow a default value anywhere in a PromQL forumla
when that particular value may go NULL but you still want a metric returned
so you can make use of that.
Thanks!
Keith
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