May 2019
Intermediate to advanced
442 pages
11h 36m
English
Content preview from Hands-On Infrastructure Monitoring with Prometheus
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Logical operators
Logical operators are most easily understood as their set theory counterparts, as shown in the following table. These operators are the only ones in PromQL that work many-to-many. There are three logical operators that can be used between expressions:
|
Operator |
Description |
|
and |
Intersection |
|
or |
Union |
|
unless |
Complement |
The and logical operator works by only returning the matches from the left-hand side if the expression on the right-hand side has results with matching label key/value pairs. All other time series from the left-hand side that do not have a match on the right-hand side are dropped. The resulting time series will keep the name from the left operand. This is why it is also called the ...
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