TYPO3 debugging devlog

[SYS][enable_DLOG] = 0
 Boolean: Whether the developer log is enabled. See constant "TYPO3_DLOG"
[SYS][enable_errorDLOG] = 0
 Boolean: If set, errors are written to the developer log (requires an installed *devlog* extension).
[SYS][enable_exceptionDLOG] = 0
 Boolean: If set, exceptions are written to the developer log (requires an installed *devlog* extension).

rlmp_filedevlog https://docs.typo3.org/typo3cms/extensions/rlmp_filedevlog/