I've setup a Cloud HTTP sensor will all locations reporting 'Success 200' with an average response time of 250ms and is working successfully from all cloud locations.
However, whenever the sensor runs the status goes to "Warning" with message "Connection Closed Gracefully". After 16 seconds the status then returns to Up.
As a result, my log is full of "Warning" and "Up" statuses for the Cloud HTTP sensor even though there are no issues as all sensors have responded with 'Success 200' and within the 5 second default timeout.
I noticed someone else had this issue but there wasn't an answer. I also can't find the Debug Option in the Cloud HTTP settings.