Bug Report

Current Behavior

When creating a child span from a parent trace context, the parent Observation was being associated with the new Observation object after its creation. This meant that the LettuceObservationContext was not aware of the parent during the creation process, and any ObservationConvention logic that relied on the parent's presence in the context would fail.

Input Code

	@Bean
	protected ObservationPredicate observationPredicate() {
		return (name, context) -> {
			if (context instanceof LettuceObservationContext) {
				// currently context.getParentObservation() is always null.
				return context.getParentObservation() != null;
			}
		};
	}

Expected behavior/code

context.getParentObservation() returns the parent observation.

Environment

• Lettuce version(s): 6.5.5.RELEASE
• Redis version: 7.2.5

Possible Solution

Preparing context before creating observation.

Additional context

https://github.com/redis/lettuce/blob/main/src/main/java/io/lettuce/core/tracing/MicrometerTracing.java#L143