Show individually the results of querying (in the prometheus console,
non-graphical view)
health_check{job="platform-events-db", cluster="loco-prod"}
up{job="platform-events-db", cluster="loco-prod"}
Do they have exactly the same label sets? If not, you'll have to add
on(...) or ignoring(...), or use group_left.
Also note: the query you have shown will only "fill in the gaps" for
health_check if the scrape failed entirely, i.e. when up == 0. If "up" was
1, but health_check was missing, it won't fill in the gap. If that's the
case, you could try:
health_check{...} or up{...} * 0
Final note: I would be *very wary* about doing this sort of data
manipulation. There is a critical difference between a health check
failing, and a health check not running at all (or its result being lost).
If you confuse these two things, people may draw the wrong conclusions from
the data.
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