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fc4d34b354
Implements XO-2155. The OpenMetrics plugin now ships XOSTOR-specific metrics so operators can build a Grafana dashboard for XCP-ng Hyperconverged Infrastructure.
All metrics use the xcp_xostor_* prefix:
Cluster status: xcp_xostor_up, xcp_xostor_node_status (master / satellite roles + raw state from linstor-manager.healthCheck), xcp_xostor_resource_total.
Storage pool health: xcp_xostor_resource_state_count — replica counts per disk-state (UpToDate, Inconsistent, Outdated, Diskless, Unknown), aggregated per cluster.
Performance filter: a new sr_type label on every SR-tagged metric (xcp_host_disk_iops_*, xcp_host_disk_throughput_*, latency, xcp_sr_*, xcp_vdi_*, xcp_vm_disk_*). Dashboards can filter sr_type="linstor" without changing existing queries.
Active alarms: xcp_xostor_alarms_count aggregated by alarm_name (ALARM, BOND_STATUS_CHANGED, MULTIPATH_PERIODIC_ALERT) and target_type (sr / host).
Disk SMART: xcp_xostor_disk_smart_status per (host, device) with the overall-health string in a status label, sourced from smartctl.py.
Pending updates: xcp_xostor_package_update_available for xcp-ng-linstor, linstor-satellite, linstor-controller, xcp-ng-release-linstor, and xcp-ng-xapi-plugins.
Each collector caches at its own TTL (60 s for cluster and alarms, 5 min for SMART, 1 h for updates) and exposes an xcp_xostor_<feature>_up gauge so silent collection failures still show up on dashboards. A TtlCache<T> helper encapsulates the cache-plus-coalescing pattern shared by the three caching collectors.
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