release: 0.6.0: Delivery detail page, DNS badge, machine metrics, wide layout

A page per delivery (`/deliveries/{id}`), reached from the *Details* link on
Added:
  - A page per delivery (`/deliveries/{id}`), reached from the *Details* link on
  - A **DNS** badge in the domain list, one per row, carrying the same
  - Machine metrics on the status page: a **Machine** card reporting the
  - An index of the current page's own sections in the navigation column, for the
Changed:
  - Every panel page is laid out in one column of the same width, so moving
  - The mark's small-size variant — the tab icon and the `SP` initials it
  - The stamp's `SELF-HOSTED SMTP RELAY` line is set at 11.5/0.15 instead of
  - The delivery log lists what identifies a message and nothing else: time,
  - Subjects are decoded for display as well as on the way in, so the rows the
  … (4 more in CHANGELOG)

Full detail: CHANGELOG.md (0.6.0).

internal/web/handlers_status.go

@@ -40,7 +40,7 @@ func (s *Server) handleStatusRecheck(w http.ResponseWriter, r *http.Request) {
 	http.Redirect(w, r, "/status?rechecked=1", http.StatusSeeOther)
 }
 
-// statusBody collects the four local checks the fragment renders. Each one
+// statusBody collects the local checks the fragment renders. Each one
 // reports its own problem rather than failing the page, so a broken component
 // costs one line and not the whole screen.
 func (s *Server) statusBody() map[string]any {
@@ -75,7 +75,13 @@ func (s *Server) statusBody() map[string]any {
 		socketStatus = health.Worst(socketStatus, sock.Status)
 	}
 
-	overall := health.Worst(procStatus, queueStatus, cert.Status, socketStatus)
+	// Resource usage of the machine underneath. It is graded like the rest —
+	// a processor that is fully busy or a machine out of memory delays or
+	// kills the mail path — so it counts towards the headline verdict, and
+	// its rates are measured against the previous poll (internal/health).
+	machine := s.machine.Sample()
+
+	overall := health.Worst(procStatus, queueStatus, cert.Status, socketStatus, machine.Status)
 	return map[string]any{
 		"Processes":      procs,
 		"ProcessError":   procErr != nil,
@@ -83,6 +89,7 @@ func (s *Server) statusBody() map[string]any {
 		"QueueSummary":   queueSummary(queueText),
 		"QueueError":     queueErr,
 		"QueueStatus":    queueStatus,
+		"Machine":        machine,
 		"Cert":           cert,
 		"Sockets":        sockets,
 		"SocketStatus":   socketStatus,