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How can you select all the up metrics whose instance label matches the regex fe-.*?
Correct Answer: D
PromQL supports regular expression matching for label values using the =~ operator. To select all time series whose label values match a given regex pattern, you use the syntax {label_name=~"regex"}. In this case, to select all up metrics where the instance label begins with fe-, the correct query is: up{instance=~"fe-.*"} Explanation of operators: = → exact match. != → not equal. =~ → regex match. !~ → regex not match. Option D uses the correct =~ syntax. Options A and B use invalid PromQL syntax, and option C is almost correct but includes a misplaced extra quote style (~''), which would cause a parsing error. Reference: Verified from Prometheus documentation - Expression Language Data Selectors, Label Matchers, and Regular Expression Matching Rules.
