Prometheus Query with Join

[arnav...@gmail.com]

I have one metric, ideally it should be == 4. So, in case the value is 5 I should fire an alert. but the trick is, I have to check first if the value was 4 some time back (30 mins) and has now became 5 or not.

I thought I will have two separate expressions: 1) K_RpdStatus_Value offset 30m and 2) K_RpdStatus_Value.

Then I will join these two expressions based on a common label = MacAddress. But I think I am getting the syntax wrong. so the join is not working. Please guide me to handle two metrics or expressions in a single prometheus query.

[Ben Kochie]

This should be as simple as this:

K_RpdStatus_Value offset 30m == 4 and K_RpdStatus_Value == 5

Prometheus will automatically match each side on the label values.

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[arnav...@gmail.com]

I tried with this but prometheus keeps on loading and never comes back. In case it does not find a match, it should return immediately, correct? the two expressions work fine independently as well as if use OR in place of AND. So, there is no issue with the syntax there. But somehow if I use AND query keeps loading and never comes back.