The raw data in Prometheus contains multiple labels. In most cases, you only need to view the content of specified labels. In this case, you need to use a label selector. A label selector is placed in {}. The following sample code shows how to query the number of requests with an HTTP status code 400.

http_requests_total{code="400"}

In the label selector, you can use label matching operators to select labels, including

=: matches the string.

!=: does not match the string.

=~: regex-matches the string.

!~: does not regex-match the string.

Range selector

The range selector is often used to specify a period of time. The following sample code shows how to query sampling records with an HTTP status code 400 in the last 5 minutes.

http_requests_total{code="400"}[5m]

In the range selector, you can specify different periods of time.

Time Unit

Descriptions

Time Unit	Descriptions
s	Second
m	Minute
h	Hour
d	Day
w	Week
y	Year

Last updated: 2026.07.10 11:37:29

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