monitoring: move metrics state to the data array

services/monitoring/victoriametrics.nix

@@ -32,16 +32,23 @@
               targets = [ "neptun.orbit.sol:9100" ];
               labels.host = "neptun";
             }
-            {
-              targets = [ "mercury.orbit.sol:9100" ];
-              labels.host = "mercury";
-            }
             {
               targets = [ "terra.orbit.sol:9100" ];
               labels.host = "terra";
             }
           ];
         }
+        {
+          job_name = "node-exporter-mercury";
+          scrape_interval = "15s";
+          scrape_timeout = "10s";
+          static_configs = [
+            {
+              targets = [ "mercury.orbit.sol:9100" ];
+              labels.host = "mercury";
+            }
+          ];
+        }
         {
           job_name = "victoriametrics";
           static_configs = [
@@ -59,4 +66,14 @@
   # ordering, not a hard dependency: VictoriaMetrics still starts locally if
   # another host or the tailnet is temporarily unavailable.
   systemd.services.victoriametrics.after = [ "tailscaled-autoconnect.service" ];
+
+  fileSystems."/var/lib/private/victoriametrics" = {
+    device = "/mnt/data/AppData/victoriametrics";
+    fsType = "none";
+    options = [ "bind" "nofail" ];
+  };
+
+  # The service path is under /var/lib/private, so systemd would otherwise
+  # derive its mount dependency from the eMMC-backed path alone.
+  systemd.services.victoriametrics.unitConfig.RequiresMountsFor = [ "/mnt/data" ];
 }