JSON logging

[bsanchezb]

Hi,

I did some changes in order to store logs in a file a JSON format. This will produce logs looking like:

...
{"@timestamp":"2024-02-01T10:15:35.8574965Z","@version":"1","message":"+ New CommonCertificateVerifier created.","logger_name":"eu.europa.esig.dss.validation.CommonCertificateVerifier","thread_name":"pool-1-thread-6","level":"INFO","level_value":20000,"dd.trace_id":"5951534357321232569","dd.service":"org.apache.catalina.startup.Bootstrap","dd.span_id":"3966466547867123206"}
{"@timestamp":"2024-02-01T10:15:35.9732396Z","@version":"1","message":"+XAdESCertificateSource","logger_name":"eu.europa.esig.dss.xades.validation.XAdESCertificateSource","thread_name":"pool-1-thread-17","level":"INFO","level_value":20000,"dd.trace_id":"5951534357321232569","dd.service":"org.apache.catalina.startup.Bootstrap","dd.span_id":"3966466547867123206"}
{"@timestamp":"2024-02-01T10:15:36.0360798Z","@version":"1","message":"+ New CommonCertificateVerifier created.","logger_name":"eu.europa.esig.dss.validation.CommonCertificateVerifier","thread_name":"pool-1-thread-17","level":"INFO","level_value":20000,"dd.trace_id":"5951534357321232569","dd.service":"org.apache.catalina.startup.Bootstrap","dd.span_id":"3966466547867123206"}
{"@timestamp":"2024-02-01T10:15:40.3330794Z","@version":"1","message":"Analysis is DONE for 31 TLSource(s)","logger_name":"eu.europa.esig.dss.tsl.job.TLValidationJob","thread_name":"pool-2-thread-1","level":"INFO","level_value":20000,"dd.trace_id":"5951534357321232569","dd.service":"org.apache.catalina.startup.Bootstrap","dd.span_id":"3966466547867123206"}
{"@timestamp":"2024-02-01T10:15:40.9786853Z","@version":"1","message":"Online refresh is DONE.","logger_name":"eu.europa.esig.dss.tsl.job.TLValidationJob","thread_name":"pool-2-thread-1","level":"INFO","level_value":20000,"dd.trace_id":"5951534357321232569","dd.service":"org.apache.catalina.startup.Bootstrap","dd.span_id":"3966466547867123206"}
...

You should be able to find the log file under "logs/dss.log" name within tomcat folder in your Docker environment.

After you need to configure Datadog as explained at https://docs.datadoghq.com/logs/log_collection/java/?tab=logback#json-format

Best regards,
Aleksandr

P.S. Additionally, I had to revert the change within "setenv.sh" file, as it caused issues in my build. I am not sure why the change was made, but if you find it better, feel free to change it back.

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[AndesKrrrrrrrrrrr]

Depends on #27
Depends on https://github.com/island-is/infrastructure/pull/2010