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>
Existing tests relied on manually captured system data from various
points in Infix's history, making them hard to extend as we add new
features.
Move to a new model where we:
To update a unit test:
1. Use Infamy tests to setup a DUT in a known state
2. Use yanger's wrapper mode to capture the system state needed to
produce operational data for a set of YANG models
3. Use cli-pretty to create the expected output for a set of show
commands
When running unit tests, we can then use the captured data to verify
that yanger and cli-pretty works as expected without the need for a
running Infix system - just like before. The difference is that it is
now much easier to capture a new snapshot when the system evolves.
Richard Alpe