- Breaking: traces metrics now include a new `sampler_type` tag, requiring query updates; Elasticsearch index separator `:` support removed, forcing migration to `.`‑based indices.
- Feature: OAuth bearer token passthrough to ES storage, Kafka Kerberos authentication for collector/ingester, Cassandra schema builder can use credentials, and a docs generation command added.
- Bugfix/Minor: Fixed data race in Agent, improved ES JSON handling, defined logs as nested type, corrected archive storage queries, health‑check and logging fixes, added GOMAXPROCS automation, and updated UI to version 1.3.0.