manuel-hegner opened a new issue, #22123:
URL: https://github.com/apache/beam/issues/22123
### What would you like to happen?
Since the Dataflow documentation suggests to use Slf4j for logging it would
only make sense that Dataflow would also log the `org.slf4j.MDC` key value
pairs into the JSON logging object.
This could look something like this:
```java
Map<String, String> mdc = MDC.getCopyOfContextMap();
if(!mdc.isEmpty() {
generator.writeFieldName("mdc");
generator.writeStartObject();
for(Entry<String, String> entry : mdc.entrySet()) {
generator.writeStringField(entry.getKey(), entry.getValue());
}
generator.writeEndObject();
}
```
If this is an accepted feature I would be willing to work on this.
### Issue Priority
Priority: 2
### Issue Component
Component: runner-dataflow
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