HTTP/core observability

• [BUG] Duplication between Azure.Core.Http spans and HTTP client ones #37446 - need to solve it in OTel/.NET, @lmolkova will follow-up
• [BUG] Tracing: we should strip correation-context/and/or baggage when calling Azure services #41543
• Distributed tracing sample: update to .net 8 and update screenshots after Storage is released  #39960
• [FEATURE REQ] Switch tracing validation tests to ActivitySource #39782
• Return tracing checks #39914

Messaging:

• [FEATURE REQ] Implement messaging metrics #39450
• docs, dashboards, etc as a part of [FEATURE REQ] Report metrics in Azure SDKs #37698, Revamp ServiceBus monitoring docs #40660
• [FEATURE REQ] Allow users to record messaging receive/process spans as links only (no parenting) #43565
• [FEATURE REQ] Messaging tracing: support disabling per-message tracing #43355
• [BUG] Tracing: EventProcessor.Checkpoint span duration is wrong #39654

OpenAI:

• [FEATURE REQ] Improve OpenAI tracing and implement metrics #39451
• [FEATURE REQ] Azure OpenAI uses non-standard server request-id header which is redacted by default #38728