v-m/scrape: Scrape Music Assistant via Blackbox

Music Assistant doesn't expose any metrics natively.  Since we really
only care about whether or not it's accessible, scraping it with the
blackbox exporter is fine.

victoria-metrics/scrape.yml

@@ -522,3 +522,19 @@ scrape_configs:
     target_label: instance
   - target_label: __address__
     replacement: blackbox-exporter:9115
+
+- job_name: music-assistant
+  metrics_path: /probe
+  params:
+    module:
+    - http
+  static_configs:
+  - targets:
+    - music.pyrocufflink.blue
+  relabel_configs:
+  - source_labels: [__address__]
+    target_label: __param_target
+  - source_labels: [__param_target]
+    target_label: instance
+  - target_label: __address__
+    replacement: blackbox-exporter:9115