The full switch: Monitors and Disks read only the sensor API; /api/metrics retired

- stock Monitors modules fed by one sensor stream, the catalog and one batch of
  histories (GET /api/sensors/history?ids=…), through sampleAdapter.ts
- the stream closes while the page is hidden and refills its curves on return
- Disks tab live rates from the stream
- new sensors: hamlab.sample_interval, ups.last_event
- stream: asking for about the sampling rate means every sample
- NUT runtime rounded at the source

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

internal/api/server.go

@@ -110,12 +110,11 @@ func New(cfg *config.Config, sessions *auth.Sessions, mgr *term.Manager, col *me
 	m.HandleFunc("PATCH /api/terminals/{id}", s.auth(s.renameTerminal))
 	m.HandleFunc("DELETE /api/terminals/{id}", s.auth(s.deleteTerminal))
 	m.HandleFunc("GET /api/terminals/{id}/attach", s.auth(s.attach))
-	m.HandleFunc("GET /api/metrics", s.auth(s.metricsLatest))
-	m.HandleFunc("GET /api/metrics/history", s.auth(s.metricsHistory))
 	m.HandleFunc("GET /api/sensors", s.sensorAuth(s.sensorCatalog))
 	m.HandleFunc("GET /api/sensors/query", s.sensorAuth(s.sensorQuery))
 	m.HandleFunc("POST /api/sensors/query", s.sensorAuth(s.sensorQuery))
 	m.HandleFunc("GET /api/sensors/stream", s.sensorAuth(s.sensorStream))
+	m.HandleFunc("GET /api/sensors/history", s.sensorAuth(s.sensorHistories))
 	m.HandleFunc("GET /api/sensors/prometheus", s.sensorAuth(s.sensorProm))
 	m.HandleFunc("GET /metrics", s.sensorAuth(s.sensorProm))
 	m.HandleFunc("GET /api/sensors/{id}", s.sensorAuth(s.sensorOne))
@@ -652,21 +651,6 @@ func (s *Server) me(w http.ResponseWriter, _ *http.Request) {
 	})
 }
 
-// ---- metrics (Dashboard) ----
-
-func (s *Server) metricsLatest(w http.ResponseWriter, _ *http.Request) {
-	smp, ok := s.metrics.Latest()
-	if !ok {
-		jsonErr(w, 503, "no sample yet")
-		return
-	}
-	jsonOK(w, 200, smp)
-}
-
-func (s *Server) metricsHistory(w http.ResponseWriter, _ *http.Request) {
-	jsonOK(w, 200, s.metrics.History())
-}
-
 // ---- sensors: the standard read interface (SENSORS.md) ----
 
 // sensorCatalog lists every sensor with its current value; ?ids= narrows it with
@@ -713,6 +697,16 @@ func (s *Server) sensorHistory(w http.ResponseWriter, r *http.Request) {
 	jsonOK(w, 200, h)
 }
 
+// sensorHistories is many histories in one request: ?ids= takes IDs and globs.
+func (s *Server) sensorHistories(w http.ResponseWriter, r *http.Request) {
+	match, err := sensors.Matcher(r.URL.Query().Get("ids"))
+	if err != nil {
+		jsonErr(w, 400, err.Error())
+		return
+	}
+	jsonOK(w, 200, map[string]any{"series": s.sensors.Histories(match)})
+}
+
 // sensorProm is every numeric sensor in the Prometheus text format.
 func (s *Server) sensorProm(w http.ResponseWriter, _ *http.Request) {
 	w.Header().Set("Content-Type", "text/plain; version=0.0.4; charset=utf-8")
@@ -770,6 +764,11 @@ func (s *Server) sensorStream(w http.ResponseWriter, r *http.Request) {
 	if ms, err := strconv.Atoi(r.URL.Query().Get("every")); err == nil && ms > 0 {
 		every = time.Duration(ms) * time.Millisecond
 	}
+	// Asking for roughly the sampling rate means "every sample": don't let timer jitter
+	// drop alternate ticks.
+	if iv := s.metrics.Interval(); every <= iv+iv/2 {
+		every = 0
+	}
 	h := w.Header()
 	h.Set("Content-Type", "text/event-stream")
 	h.Set("Cache-Control", "no-store")