[Proposal] SLG-0005: LogEvent LogHandler API

[kukushechkin (Vladimir Kukushkin)]

@samuelmurray

We already said that error should not be implemented before this one - does that mean that we make one release with all three additions/changes? This would be a somewhat large release, but could help avoid a cluttered API.

I think Error support in LogEvent is additive. AttributedMetadata can be additive as well, if we keep both plain and attributed metadata.

I would still discuss if LogEvent should have only attributed metadata, or both plain and attributed metadata. This would also couple this proposal to the SLG-0004, which indeed introduces complexity.