Dashboard tab: CPU/mem/load, hwmon temps+fans, net, disks, filesystems, UPS with 10-min sparklines

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

internal/api/server.go

@@ -17,6 +17,7 @@ import (
 
 	"hamlab/internal/auth"
 	"hamlab/internal/config"
+	"hamlab/internal/metrics"
 	"hamlab/internal/term"
 )
 
@@ -27,6 +28,7 @@ type Server struct {
 	sessions *auth.Sessions
 	limiter  auth.Limiter
 	mgr      *term.Manager
+	metrics  *metrics.Collector
 	version  string
 	started  time.Time
 	user     string
@@ -35,9 +37,9 @@ type Server struct {
 	mux      *http.ServeMux
 }
 
-func New(cfg *config.Config, sessions *auth.Sessions, mgr *term.Manager, ui fs.FS, version string) *Server {
+func New(cfg *config.Config, sessions *auth.Sessions, mgr *term.Manager, col *metrics.Collector, ui fs.FS, version string) *Server {
 	host, _ := os.Hostname()
-	s := &Server{cfg: cfg, sessions: sessions, mgr: mgr, ui: ui, version: version,
+	s := &Server{cfg: cfg, sessions: sessions, mgr: mgr, metrics: col, ui: ui, version: version,
 		started: time.Now(), host: host, user: os.Getenv("USER")}
 	if s.user == "" {
 		s.user = "core"
@@ -52,6 +54,8 @@ func New(cfg *config.Config, sessions *auth.Sessions, mgr *term.Manager, ui fs.F
 	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("/api/", func(w http.ResponseWriter, _ *http.Request) { jsonErr(w, 404, "not found") })
 	m.HandleFunc("/", s.static)
 	s.mux = m
@@ -162,6 +166,21 @@ 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())
+}
+
 // ---- terminals ----
 
 func (s *Server) listTerminals(w http.ResponseWriter, _ *http.Request) {