[0.0.20/chart 0.1.8] error messages in the production logs (no failure on the main features though)

[dduportal]

With the version 0.0.24 (helm chart v0.1.8 deployed by jenkins-infra/kubernetes-management#3089) in production, the application works as expected for the main use cases (user accounts and administration).

However the logs are showing the following 2 errors that should be fixed in the future (not blocking):

• Log4j initialization error:

log4j:ERROR Could not instantiate appender named "logfile".

• Datadog Agent: connection failing:

[dd-agent-writer] WARN datadog.trace.agent.common.writer.DDApi - Error while sending 5 of 5 traces to the DD agent. java.net.ConnectException: Connection refused (Connection refused) (going silent for 5 minutes)

For both errors:

• I don't know if these error lines were already present with the previous production version (0.0.10)
• It's not necessarly an error with the application in itself: can be the productions values (https://github.com/jenkins-infra/kubernetes-management/blob/main/config/accountapp.yaml) and/or the helm chart default values (https://github.com/jenkins-infra/helm-charts)
• Could be an error with the default config.properties.example like it was for chore(Dockerfile) correct the DD_AGENT download #170