- Added Unix Domain Socket support for APM receiver, environment‑variable interpolation in check configs, new systemd integration, and ability to set global tags in Fargate via DD_TAGS.
- Significant APM performance upgrades: memory usage reduced up to 10×, CPU usage ↓20%, faster resource‑usage monitoring interval, and a rewritten queued sender for better network‑failure handling.
- Security fix for Windows service registration mitigates CVE‑2014‑5455; numerous bug fixes including correct NTP port parsing, JMXFetch hangs, TLS handshake stalls, and log format issues.
6.13.0
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Added more trace collection during SSI installation on Linux hosts.
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