In URL_RESPONSE when url_response matches a substring with "found" it generates a QOS metric as '1'.
However, when string is NOT found the probe generates a NULL.
This makes data visualization in OI hard for the customer.
Release : 20.3
Component : UIM - URL_RESPONSE - 4.50
Probe Limitation. Current version of the probe (4.50) generates a NULL when string is not found.
The upcoming probe release will be enhanced and it will generate a '0' instead of NULL when the 'string not found' event occurs.
The fix will be included in the next release of the probe.