totoro: move all rules into a single group

ops/nixos/totoro/default.nix

@@ -237,8 +237,10 @@ in {
     rules = [
       ''
         groups:
-        - name: blade-oa
+        - name: alerting
           rules:
+
+          # Blade power
           - alert: AveragePowerUsageTooHigh
             expr: (sum(avg_over_time(cpqRackPowerSupplyCurPwrOutput{job="blade-oa/snmp"}[10m])) / 230) > 6.5
             labels:
@@ -262,8 +264,8 @@ in {
             annotations:
               summary: "Blade: Single Blade Power Usage Out of Bounds"
               description: "{{ $labels.system }} has power usage of {{ $value }}, which is out of expected bounds."
-      - name: availability
-        rules:
+
+        # Systems
         - alert: NodeExporterDown
           expr: up{exporter="node", system=~"(blade-(tuvok|paris|janeway|torres)|kusakabe|marukuru|swann|totoro|clouvider-.*|etheroute-.*)"} < 1
           for: 30m
@@ -272,8 +274,8 @@ in {
           annotations:
             summary: "Node exporter no longer scrapable"
             description: "{{ $labels.system }} is not reachable from totoro."
-      - name: nixos
-        rules:
+
+        # Alert if the NixOS channels are broken
         - alert: NixOSChannelBad
           expr: hydra_job_failed{} == 1
           for: 30m