Dashboard: Processes module (top by CPU/memory, PID, user, threads, SIGTERM), sampled at most every 2 s

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

internal/api/server.go

@@ -16,6 +16,7 @@ import (
 	"path/filepath"
 	"strconv"
 	"strings"
+	"syscall"
 	"time"
 
 	"github.com/coder/websocket"
@@ -125,6 +126,7 @@ func New(cfg *config.Config, sessions *auth.Sessions, mgr *term.Manager, col *me
 	m.HandleFunc("GET /api/storage/zfs/snapshots", s.auth(s.zfsSnapshots))
 	m.HandleFunc("POST /api/storage/zfs/scrub/{pool}/{action}", s.auth(s.zfsScrub))
 	m.HandleFunc("POST /api/storage/zfs/snapshot", s.auth(s.zfsSnapshot))
+	m.HandleFunc("POST /api/procs/{pid}/signal", s.auth(s.procSignal))
 	m.HandleFunc("GET /api/prefs/dashboard", s.auth(s.getDashPrefs))
 	m.HandleFunc("PUT /api/prefs/dashboard", s.auth(s.putDashPrefs))
 	m.HandleFunc("/api/", func(w http.ResponseWriter, _ *http.Request) { jsonErr(w, 404, "not found") })
@@ -922,6 +924,30 @@ func (s *Server) zfsSnapshot(w http.ResponseWriter, r *http.Request) {
 	w.WriteHeader(204)
 }
 
+// ---- processes ----
+
+func (s *Server) procSignal(w http.ResponseWriter, r *http.Request) {
+	pid, err := strconv.Atoi(r.PathValue("pid"))
+	if err != nil {
+		jsonErr(w, 400, "bad pid")
+		return
+	}
+	var body struct {
+		Signal string `json:"signal"`
+	}
+	_ = json.NewDecoder(io.LimitReader(r.Body, 1024)).Decode(&body)
+	sig := syscall.SIGTERM
+	if body.Signal == "KILL" {
+		sig = syscall.SIGKILL
+	}
+	if err := metrics.Signal(pid, sig); err != nil {
+		jsonErr(w, 400, err.Error())
+		return
+	}
+	log.Printf("procs: sent %s to pid %d (from %s)", sig, pid, clientIP(r))
+	w.WriteHeader(204)
+}
+
 // ---- dashboard layout prefs (opaque JSON object, owned by the UI) ----
 
 func (s *Server) getDashPrefs(w http.ResponseWriter, _ *http.Request) {