- Agent 6.0 is a full rewrite in Go, adding higher DogstatsD throughput, check concurrency, and a native Prometheus metrics ingest.
- Introduces a web‑based configuration UI (localhost port 5002), Windows systray icon, and health‑check subsystem; configuration switches from datadog.conf to datadog.yaml.
- Breaking changes include removal of SysV init scripts, Alpine image, and custom check precedence; several integrations (Jenkins, Mesos, HDFS) are deprecated or retired.
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