Multi cluster separation

[m-tarhon]

No description provided.

[Copilot]

Pull request overview

This PR introduces multi-cluster separation by collecting cluster identifiers in snapshot metadata and wiring a cluster filter (plus “hide empty panels”) through the cbmonitor UI and backend query paths.

Changes:

• Config-manager now collects and stores clusters metadata and updates generated service-discovery URLs to emit cluster labels.
• cbmonitor UI adds cluster filtering (PromQL injection + SQL++ label filtering) and a “hide empty panels” setting via a consolidated settings dropdown.
• cbmonitor backend applies cluster filtering by translating the chosen cluster into an instance IN [...] constraint derived from snapshot metadata targets.

Reviewed changes

Copilot reviewed 46 out of 47 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
docs/config-manager-api.md	Documents cluster label emission in service-discovery URLs and updates example output.
config-manager/main.go	Adds fallback to file-based metadata storage when primary metadata storage init fails.
config-manager/internal/storage/file.go	Adds clusterLabels=... to generated prometheus_sd_config URLs.
config-manager/internal/services/metadata.go	Adds cluster discovery via /prometheus_sd_config and supports scheme selection.
config-manager/internal/api/handlers.go	Aggregates metadata across hostnames and persists combined services/clusters.
config-manager/internal/models/{snapshot.go,metadata.go}	Adds Cluster model and includes clusters in snapshot metadata.
cbmonitor/src/services/{clusterFilterService.ts,layoutService.ts,pageBuilder.ts}	Adds cluster filter state + hide-empty persistence and scene cache key expansion.
cbmonitor/src/utils/utils.panel.ts	Injects cluster filters into PromQL / SQL++ and hides panels when data is empty.
cbmonitor/src/pages/snapshotViewPage.ts	Adds SettingsDropdown control and resets cluster filter when switching snapshots.
cbmonitor/src/components/{SettingsDropdown/*,SnapshotDisplay/metadataSummary.tsx}	New settings UI; adds snapshot-id copy affordance in metadata summary.
cbmonitor/pkg/{handlers/snapshot.go,querybuilder/querybuilder.go,services/snapshot.go,models/snapshot.go}	Adds clusters to metadata model and applies cluster filtering via instance constraints.
config-manager/tests/* (deleted)	Removes multiple tests (config, manager, API integration, metadata).
cbmonitor/dashboards/*.json (deleted)	Removes several static dashboard JSONs.

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