The FPM error log records server-level issues with FPM's process management in PHP. It is closely related to the PHP error log, which records application-level issues encountered while processing a request. The FPM error log only handles web requests; command-line requests are logged in the PHP error log.
For a list of the log files handled by Acquia Cloud, including accessing these log files, log file retention, and their locations, see About Acquia Cloud logging.
Parsing the log file
The following line is a representative example of the data written into your website's FPM error log:
[04-Jan-2017 18:45:13] NOTICE: [pool alphabeta] child 20069 exited with code 0 after 3832.234353 seconds from start
Each of the items in the FPM error log is noted in the following table, along with its description:
||The date and time of the request|
||The issue severity — possible values:
||The FPM pool the error occurred in|
|3||All other information in the line||The message, which will vary from line to line|