* fix: reduce reconnect redeploy and metrics load
Throttle node-online redeploy retries and lower the agent metric cadence so brief reconnect churn no longer fans out into repeated runtime syncs and backend connection pressure.
* docs: add follow-up implementation design notes
Document the planned flow upload batching work and the local remote-address toggle so the next changesets can implement them against an agreed design.
* docs: add implementation plan for max conn limit
* feat: add CLimiters support for websocket reporter
* feat: add max_conn field to user and forward models
* feat: implement max conn limiter dispatching
* feat: add maxConn to user and forward CRUD API
* feat: add max conn UI to user management and forward rules
* fix: load MaxConn in get forward record and add e2e contract test for max conn limit
- Pass tunnel protocol through diagnosis work items
- Support protocol-specific ping (TCP/UDP/KCP) via remote nodes
- Add KCP probe support in websocket_reporter for chain hop testing
- Add NodeMetric/TunnelMetric/ServiceMonitor models and repository methods
- Implement metrics ingestion service with per-minute bucket aggregation
- Add health checker for node connectivity monitoring
- Wire node metrics from WebSocket SystemInfo messages
- Add tunnel metrics ingestion from flow upload endpoint
- Create monitoring REST API endpoints for nodes, tunnels, services
- Implement service monitor CRUD and execution (TCP/ICMP checks)
- Add MonitorPermission for non-admin access control
- Create frontend monitor page with node/tunnel/service views
- Add tunnel metrics ingestion from agent flow reports
- Include schema migration for tunnel_metric unique index
- Fix tunnel entry port conflict validation to use transaction
Entire-Checkpoint: 030821a7c8e3
When multiple TcpPing requests are sent in parallel for diagnosing
multiple remote addresses, the Go agent was processing them serially.
This caused later requests to timeout (10s) while waiting for earlier
requests to complete.
Changes:
- Only TcpPing commands run in goroutines for parallel execution
- TcpPing (read-only diagnostic) no longer triggers saveConfig()
- Other state-mutating commands remain synchronous with config save
- Add mutex to saveConfig() to protect concurrent file writes
sagit