feat(channels): include event verb in ntfy title + smtp subject (#10)

Co-authored-by: Steve Cliff <steve@devcloud.guru>
Co-committed-by: Steve Cliff <steve@devcloud.guru>

internal/notification/ntfy.go

@@ -58,14 +58,34 @@ func (c *NtfyChannel) Send(ctx context.Context, p Payload) (int, time.Duration,
 	server := strings.TrimRight(c.cfg.ServerURL, "/")
 	url := server + "/" + c.cfg.Topic
 
-	req, err := http.NewRequestWithContext(ctx, http.MethodPost, url, bytes.NewBufferString(p.Message))
+	// Body carries the event verb so the body alone is unambiguous when
+	// it shows up on a phone lockscreen without the title.
+	body := p.Message
+	switch p.Event {
+	case EventResolved:
+		body = "Resolved · " + p.Message
+	case EventAcknowledged:
+		body = "Acknowledged · " + p.Message
+	}
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost, url, bytes.NewBufferString(body))
 	if err != nil {
 		return 0, 0, fmt.Errorf("ntfy: build request: %w", err)
 	}
 
+	// Title prefix tracks the event so raise vs ack vs resolve are
+	// visually distinct in the ntfy notification list.
+	verb := "raised"
+	switch p.Event {
+	case EventAcknowledged:
+		verb = "ack"
+	case EventResolved:
+		verb = "resolved"
+	case EventTest:
+		verb = "test"
+	}
 	req.Header.Set("Content-Type", "text/plain")
-	req.Header.Set("Title", fmt.Sprintf("[%s] %s %s", p.Severity, p.HostName, p.Kind))
-	req.Header.Set("Tags", p.Severity+","+p.Kind)
+	req.Header.Set("Title", fmt.Sprintf("[%s · %s] %s %s", verb, p.Severity, p.HostName, p.Kind))
+	req.Header.Set("Tags", verb+","+p.Severity+","+p.Kind)
 	req.Header.Set("Priority", priorityForSeverity(p.Severity, c.defaultPriority))
 	if p.Link != "" {
 		req.Header.Set("Click", p.Link)