Update exception recording guidelines to not use span events

[pellared]

Together with open-telemetry/opentelemetry-specification#4825

Towards OTEP: Span Event API deprecation plan

Towards open-telemetry/opentelemetry-go-contrib#8386 (merged "prototype")

Changes

• Remove the recommendation to use Span.RecordException for error recording
• Update the recording exception example to record logs and metrics.
• Deprecate "Semantic conventions for exceptions on spans" document in favor of logs for recording exceptions

[Copilot]

Pull request overview

This PR updates the OpenTelemetry semantic conventions to deprecate recording exceptions as span events in favor of using log records. This change aligns with OTEP 4430's Span Event API deprecation plan and provides clearer guidance on exception handling across different signals.

Key changes:

• Deprecates the event.exception convention, marking it as obsoleted with guidance to use logs instead
• Updates error recording guidelines to recommend logging exceptions rather than using Span.recordException API
• Revises the code example to demonstrate proper exception recording using logger APIs along with span status and metrics

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
model/exceptions/deprecated/events-deprecated.yaml	Adds deprecation metadata to the exception event, marking it as obsoleted with a note to use logs
docs/general/recording-errors.md	Updates exception recording section to recommend logs over span events and revises the code example to demonstrate logger usage
docs/exceptions/exceptions-spans.md	Updates status badge from Stable to Deprecated with explanatory note
.github/copilot-instructions.md	Updates internal guidelines to reflect that exceptions should be recorded as log records only
.chloggen/3256.yaml	Adds changelog entry for the exception recording guideline update

[pellared]

@lmolkova, @trask, PTAL
I tried to make it as minimal as possible to avoid more bike-shedding. I still think that there are things that has to be improved like when an exception is not an error. But it deserved separate PRs.

[Copilot]

Pull request overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated 4 comments.