There is a known bug with the New Relic PHP agent that causes it to stop reporting data when it is upgraded.
When I ran into this recently it made me think, “it would be nice if I could have New Relic send me an alert when it stops receiving data from the application.”
Some Googling revealed that unfortunately, this is easier said than done.
The best option appears to be a create an alert based on a NRQL query which checks the
count of transactions from the application.
It seems like there should be an on / off switch for this somewhere in the APM settings and it should default to on…
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