This page includes some tips and tricks for using Wavefront Query Language, and points to additional information to help you drill down.
Use WQL Examples
The Query Language Examples doc page has sample queries for many use cases. In addition, you can look at our integration dashboards and copy queries from there.
Learn What to Do
Understand how to improve performance and solve problems:
- Optimize Query Language Performance
- Optimize the Data Shape to Improve Performance
- Troubleshooting Missing Data
Learn about frequently used functions:
Tips and Tricks from the Pros
Learn How WQL Works
To understand potential problems and to become a power user of WQL, the following pages (some with video) can help:
- Discrete and Continuous Time Series
- Pairing Up Matching Time Series
- Aggregating Time Series
- Point Tags in Queries
Use AND, OR, and NOT Operators
Wavefront provides the following boolean operators for use in query expressions:
- AND, and
- OR, or
- NOT, not
You can use combination of AND, OR and NOT operators in query line.
ts(my_metric AND source=server_1 OR source=server_2 OR env=prod AND NOT app=my_app)
is the same as:
ts(my_metric, source=server_1, source=server_2, env=prod AND NOT app=my_app)
The comma after the metric name is interpreted as AND. Subsequent commas are interpreted as OR.
Using AND Operators Between ts() Expressions
AND and OR operators return boolean output when used between
ts(my_metric, source=server_1) and ts(my_other_metric, env=prod) and ts(..) and ..
Returns output as
0 (False) or
1 (True). The value is:
1if values for all
ts()expressions are non-zero
0if values for all ts() expressions are zero
A boolean query is frequently used in alert conditions when you want to trigger alert only when more than one ts() expression condition is true.
For example, suppose the following alert condition is used;
ts(cpu.percent.metric) > 85 and ts(memory.percent.metric) > 80
That condition will only become true (boolean “1”) when both ts() conditions are true.
Using OR Operators Between ts() Expressions
You can use OR operators between the ts() expressions, like this:
ts(my_metric, source=server_1) or ts(my_other_metric, env=prod) or ts(..) or ..
The output will be a
0 (False) or
1if any of the ts() expressions have a non-zero value.
0if all of the ts() expressions have zero values.
or. A comma does not work.
Using a Comma to mean AND or OR
Comma can mean AND
A comma “,” immediately after a metric name in a ts() expression is considered an AND operator:
When you use a comma (
,) used after the metric, the query engine interprets the comma as AND when executing the query.
is same as:
ts(my_metric AND source=server_1)
Comma can mean OR
A comma “,” that is not used right after the metric name but somewhere else in the query line is interpreted as an OR operator.
ts(my_metric, source=server_1, env=prod)
is same as:
ts(my_metric and source=server_1 or env=prod)