chore: release v13.9.0

[github-actions]

v13.9.0 (2026-01-08)

Features

• Added entity_guid to Agent Control health file (#3594) (f42a501)
• Added instrumentation support for iovalkey (#3612) (55f5d6e)
• Added support for OTel span events (#3600) (5b7c340)
• Additional support for partial granularity traces (Not available for production use)
  • Added compact type for partial granularity traces. (#3608) (73b0381)
  • Added core tracing supportability metrics (#3610) (c465f4c)
  • Updated metric names for full and partial traces to consolidate like values (#3620) (b201338)

Bug fixes

• Account for links added during transaction (#3606) (488b678)
• Updated samplers to properly assign sampling decisions based on appropriate context (#3641) (4bbdddf)
• Updated undici instrumentation to track the active and parent segment as symbols on request to properly end active request (#3619) (9baebe5)

Code refactoring

• Removed unused distributed_tracing.in_process_spans.enabled logic. Partial granularity tracing replaces it (#3611) (1d5584e)
• Updated @langchain/core instrumentation to subscribe to events emitted (#3493) (d1e90e4)

Documentation

• Updated compatibility report (#3635) (74ac737)

Miscellaneous chores

• Changed Langchain to LangChain, expand version range (#3629) (d77239e)
• Copy OTEL status metadata to segment (#3613) (4057e80)
• deps: Updated @newrelic/security-agent to v3.0.0 (#3637) (a84fa74)
• Don't create OpenAI segments if ai_monitoring is disabled (#3625) (b4f0010)
• Limit number of span links on segments (#3621) (c923c30)
• Updated Azure publishing with OIDC steps (#3633) (14c41c0)

Tests

• Centralized indices for redis versioned tests (#3636) (34f6562)
• Change LangChain tool test to >=0.2.0 (#3631) (3a4980f)
• Fixed LangChain test targets (#3634) (6504eb8)
• Refactored LangChain versioned tests (#3624) (12ae601)