* feat(obs): export on-demand migration bucket metrics
Add the on_demand_migration metric subsystem: per-bucket request,
pull, failure, inflight, queue depth, source latency distribution and
breaker state series fed from the ODM runtime snapshot through the
storage boundary, collected alongside bucket replication metrics, and
retired once a bucket's config disappears.
* feat(admin): report the full on-demand migration status snapshot
Extend GET /v3/on-demand-migration/{bucket}/status with provider,
endpoint host, breaker state, runtime counters, last source error,
inflight and queue gauges and the config timestamp. served_by_source_ratio
stays null: no per-bucket GET total exists to divide by. Update the
madmin status type and golden fixture together.
Zhengchao An
07dce1cab0