feat: add radosgw-admin multisite read wrappers - #809
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Add the inert read-only plumbing for RGW multisite replication (CE062): a radosgw-admin exec wrapper with a remote-cluster variant and typed, JSON-backed wrappers for realm get, zonegroup get, zone get, metadata sync status, per-source data sync status, and the mdlog/datalog head markers. Catch-up verdicts are computed deterministically from local sync markers versus the peer's log heads (readable over RADOS through an imported remote), using the same per-shard comparison rule the radosgw-admin sync status text applies internally; that text is not parsed at all since the command ignores --format json on both squid and tentacle. Failing commands yield zero-value results with a nil error, mirroring the RBD wrapper contract, so the upcoming replication handler can treat an unconfigured gateway as ordinary disabled state. Fixtures are captured from a live two-site squid deployment, covering master, secondary and unconfigured views. Nothing calls this code yet; the replication handler arrives in a follow-up. Assisted-by: claude-code:claude-fable-5 Signed-off-by: John Ramsden <john.ramsden@canonical.com>
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Description
Add plumbing for RGW multisite replication
Failing commands yield zero-value results with a nil error, mirroring the RBD wrapper contract, so the upcoming replication handler can treat an unconfigured gateway as ordinary disabled state.
Fixtures are captured from a live two-site squid deployment, covering master, secondary and unconfigured views.
Nothing calls this code yet; the replication handler arrives in a follow-up.
Type of change
How has this been tested?
Mocked unit tests exercise new functions
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