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Chris Lu b883fedc23 admin: add connected mount clients page and dashboard section
The filer is the authority on who is subscribed to its metadata stream
(FUSE/VFS mounts, S3, peer filers, ...), but its in-memory listener
registry only tracked clientId->epoch and was not exposed.

- Enrich the filer subscriber registry with name/type/address/path/
  connected-time, populated in addClient and cleared in deleteClient so
  it reflects currently-connected clients only.
- Add a ListMetadataSubscribers filer gRPC (optional client-type filter).
- Admin server fans out to every filer, filters to mount types
  ("mount" Go weed mount, "sw-vfs" Rust VFS), and renders a new
  Cluster > Mount Clients page plus a Mount Clients dashboard section.

Read-only; no behavior change to the subscribe hot path.
2026-06-14 17:22:05 -07:00
..
2024-11-18 22:41:59 -08:00
2025-11-26 18:22:32 -08:00
2024-11-18 22:41:59 -08:00