Feature Request: Tag collected logs with source like stdout / stderr

[TiloGit]

Logs coming from container stderr and stdout don't have a tag that indicates they are coming from stderr vs stdout stream.

Azure Log monitoring does provide a tag what the original of the log was. “LogSource” see screenshot of this ticket: DataDog/datadog-operator#1600

Could you please add such a tag for containers monitored by the datadog-operator/agent

here my first attempt at request with operator DataDog/datadog-operator#1638