Merge branch 'add-systemd-deps-to-tahoe-metric-collector' into 'develop'

Monitoring/tahoe metrics collector: Add systemd dependency declarations

See merge request !220

nixos/modules/monitoring/exporters/tahoe.nix

@@ -39,12 +39,14 @@ in {
   config =
     lib.mkIf cfg.enable {
       environment.systemPackages = [ pkgs.curl ];
+
       systemd.services.tahoe-metrics-collector = {
         enable = true;
         description = "Tahoe metrics gathering service";
-        wantedBy = [ "multi-user.target" ];
+        after = [ "tahoe.storage.service" ];
         startAt = cfg.interval;
         path = [ pkgs.curl ];
+        restartIfChanged = false;
 
         # Save to a temp file and then move atomically so the
         # textfile collector won't read a partial file.
@@ -54,6 +56,10 @@ in {
           mv "${cfg.outFile}.tmp" "${cfg.outFile}"
         '';
       };
+
+      systemd.timers.tahoe-metrics-collector = {
+        after = [ "tahoe.storage.service" ];
+      };
   };
 }