Reference to the isBlank() and isEmpty() string manipulation functions
Summary
isBlank(metric|source|<pointTagKey>, <tsExpression>)
isEmpty(metric|source|<pointTagKey>, <tsExpression>)
The isBlank() function returns true if the specified metadata string is a blank character (" "), and returns false otherwise.
The isEmpty() function returns true if the specified metadata string is the empty string, and returns false otherwise.
Parameters
| Parameter | Description |
|---|---|
| metric|source|<pointTagKey> | The metadata string (metric name, source name, or value of a point tag key) to be tested. |
| tsExpression | The expression that describes the time series with the metadata string to be tested. |
Example
The following examples illustrate how isBlank() works:
- In this first screenshot, we check whether the value of the
servicepoint tag is the empty string. In this case, the result isfalse.
- In the second example, we’re using the
taggify()function to replace the result of the query with the empty string, and then we callisBlank(). Now the result is true.
