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Richard Alpe
c767a6f9a0
Dump operational datastore to timestamped JSON snapshots every 5 minutes (in /var/lib/statd/). The operational.json symlink always points to the latest snapshot. Implement hierarchical retention policy that keeps the first snapshot of each time period (hour/day/week/month/year), providing fine-grained recent history while preventing unbounded disk usage. This will allow us to plot / track how the system state evolves as well as give us somewhat fine-grained info in the case of an event, such as a crash. Add unit test simulating months of snapshots to verify retention behavior using a statd stub that only runs the retention code locally (unit test) Signed-off-by: Richard Alpe <richard@bit42.se>