chrony 4.7–4.8 Knowledge Patch

Baseline: chrony through 4.6.x. Covered range: chrony 4.7 through 4.8, plus the included operational and deployment guidance.

Reference index

Reference	Topics
core-configuration.md	Upgrade requirements, daemon and client behavior, source options, packet controls, logging, service integration
reference-clocks.md	RTC, PHC, PPS, GPS, gpsd, reachability, locking, startup, and time scales
hardware-timestamping-and-ptp.md	Hardware timestamping, interleaved NTP, NTP-over-PTP, transparent clocks, PHCs, and virtualization
network-time-security.md	NTS client state, authentication diagnostics, server setup, policy compatibility, and verification
monitoring-and-troubleshooting.md	`chronyc`, exporter metrics, source selection, transport errors, client records, and network recovery

Check the upgrade notes before carrying an older configuration or build setup forward.
Use the quick references below for common decisions, then load the indexed topic file for constraints and edge cases.
Treat examples as fragments: retain the access controls, source diversity, measured offsets, and platform-specific paths required by the deployment.