Support custom MDC key with otel.bridge.Slf4JEventListener

[ShenFeng312]

like this

        private static final String DEFAULT_TRACE_ID_KEY = "traceId";

	private static final String DEFAULT_SPAN_ID_KEY = "spanId";

	private final String traceIdKey;

	private final String spanIdKey;

	public Slf4JEventListener()
	{
		this(DEFAULT_TRACE_ID_KEY,DEFAULT_SPAN_ID_KEY);
	}
	public Slf4JEventListener(String traceIdKey, String spanIdKey)
	{
		this.traceIdKey = traceIdKey;
		this.spanIdKey = spanIdKey;
	}

	private void onScopeAttached(EventPublishingContextWrapper.ScopeAttachedEvent event)
	{
		log.trace("Got scope changed event [{}]", event);
		Span span = event.getSpan();
		if (span != null) {
			MDC.put(traceIdKey, span.getSpanContext().getTraceId());
			MDC.put(spanIdKey, span.getSpanContext().getSpanId());
		}
	}

[marcingrzejszczak]

Makes sense! Are you willing to file a pr?

[ShenFeng312]

Makes sense! Are you willing to file a pr?

yes