如何在 LOKI 中使用二元运算符？ 格拉法纳

Question

I'm creating a panel to show the error count in logs for canary instances. First, I need to find whether the instance is canary or not. So, if the instance is canary then I have to show the error log count for that instance.

To filter the canary instance - I have stack label so if the stack contains one instance then it should be a canary instance.

The expression should check the instance count of each and every stack, if a stack has one instance then it needs to search for the keyword in the log.

How do achieve this? I am looking for an expression something like below.

sum(count_over_time({component="stack-blue.*" ,cloud=~"${cloud}" ,environment=~"${environment}" ,location=~"${location}" } |= "Unable to record" [$__interval]))
and
(count(count by(hostname)(count_over_time({component="stack-blue.*",cloud=~"${cloud}" ,environment=~"${environment}" ,location=~"${location}"  } [$__interval]))) == 1)

Answer 1

You can combine two separate queries A and B with a Math expression $A && $B.

Note that you can decide whether a query or expression is displayed in the panel by clicking on the eye symbol.