binary content printed in the filterx trace/debug logs

[jszigetvari]

AxoSyslog

Version of AxoSyslog

axosyslog 4 (4.7.1.680.gee6232f)
Config version: 4.2
Installer-Version: 4.7.1.680.gee6232f+4.7.1_git20240604
Revision: 
Compile-Date: Jun  4 2024 23:09:15

Platform

docker, amd64

Debug bundle

N/A

Issue

Failure

When havig debug and trace logs enabled, axosyslog will print the result of a filterx block into its internal log.
In practice this is the value of the last statement in the block.
If that last statement is of a complex value, then it can happen that axosyslog will print the content of a protobuf's binary contents to its internal log, which may cause problems in any tools trying to parse the content of the internal log (as utf-8, in my case).

When printing to the internal log, we at least should try to escape or convert to text, the things being written to internal logs.