Attempt to bring up email notifications for alerts

The email sending works, but apparently because the
alerting rules are not grafana managed, grafana is
not sending alerts on them.

nix/systems/aarch64-linux/mx.kaareskovgaard.net/mailserver/accounts.nix

@@ -131,11 +131,11 @@ let
   ) [ ] cfg.accounts;
 
   systemAccountsPassDbTemplateContents =
-    lib.concatStringsSep "\n" (
+    lib.concatStrings (
       lib.lists.map (account: ''
         {{- with secret "mx.kaareskovgaard.net/data/users/${account}" -}}
         ${account}:{{ .Data.data.hashed_password }}::::::
-        {{- end -}}
+        {{ end -}}
       '') systemAccounts
     )
     # Just make sure the file is not empty

nix/systems/aarch64-linux/mx.kaareskovgaard.net/users.nix

@@ -15,4 +15,9 @@
     addresses = [ "git@kas.codes" ];
     sendOnly = true;
   };
+  "monitoring" = {
+    name = "monitoring.kaareskovgaard.net";
+    addresses = [ "monitoring@kas.codes" ];
+    sendOnly = true;
+  };
 }

nix/systems/x86_64-linux/monitoring.kaareskovgaard.net/alerts/http.yaml

@@ -10,8 +10,8 @@
         summary: "Nginx on {{ $labels.instance }} is down"
     - alert: HighHttpErrorRate
       expr: >
-        sum by(vhost, instance) (rate(http_response_count_total{status=~"5..",job="nginxlog"}[1m])) /
-        sum by(vhost, instance) (rate(http_response_count_total{job="nginxlog"}[1m]))
+        sum by(vhost, instance) (rate(http_response_count_total{status=~"5..",job="nginxlog"}[10m])) /
+        sum by(vhost, instance) (rate(http_response_count_total{job="nginxlog"}[10m]))
         > 0
       for: 30m
       labels:

nix/systems/x86_64-linux/monitoring.kaareskovgaard.net/alerts/job_up.nix

@@ -29,7 +29,7 @@ in
       - alert: JobDown
         expr: >
           ${exprs}
-        for: 10m
+        for: 1m
         labels:
           severity: critical
         annotations:

nix/systems/x86_64-linux/monitoring.kaareskovgaard.net/default.nix

@@ -52,6 +52,7 @@ let
   );
 
   oauthCredentialFile = config.khscodes.infrastructure.kanidm-client-application.secretFile;
+  smtpPasswordFile = "/run/secret/grafana/smtp/password";
 in
 {
   imports = [
@@ -61,6 +62,7 @@ in
   systemd.services.grafana = {
     unitConfig.ConditionPathExists = [
       oauthCredentialFile
+      smtpPasswordFile
     ];
   };
   services.grafana = {
@@ -102,6 +104,16 @@ in
         org_mapping = "*:*:Admin";
         role_attribute_path = "'GrafanaAdmin'";
       };
+
+      smtp = {
+        enabled = true;
+        from_name = "monitoring.kaareskovgaard.net";
+        from_address = "monitoring@kas.codes";
+        ehlo_identity = "monitoring.kaareskovgaard.net";
+        host = "mx.kaareskovgaard.net:465";
+        password = "$__file{${smtpPasswordFile}}";
+        user = "monitoring";
+      };
     };
     provision = {
       enable = true;
@@ -156,6 +168,30 @@ in
           options.path = postfixDashboard;
         }
       ];
+      alerting = {
+        contactPoints.settings.contactPoints = [
+          {
+            orgId = 1;
+            name = "Default";
+            receivers = [
+              {
+                uid = "khs";
+                type = "email";
+                settings = {
+                  addresses = "kaare@kaareskovgaard.net";
+                };
+              }
+            ];
+          }
+        ];
+        policies.settings.policies = [
+          {
+            orgId = 1;
+            receiver = "Default";
+            group_by = [ "instance" ];
+          }
+        ];
+      };
     };
   };
   services.prometheus = {
@@ -163,9 +199,10 @@ in
     listenAddress = "127.0.0.1";
     extraFlags = [
       "--web.enable-otlp-receiver"
-      "--storage.tsdb.retention.time=15d"
+      "--storage.tsdb.retention.time=60d"
     ];
-    # alertmanager.enable = true;
+    # I think I need to move these into grafana managed rules, in order to get notifications
+    # working properly.
     rules = [
       ''
         groups:
@@ -227,7 +264,7 @@ in
       compactor = {
         retention_enabled = true;
         compaction_interval = "24h";
-        retention_delete_delay = "15d";
+        retention_delete_delay = "${builtins.toString (60 * 24)}h";
         delete_request_store = "filesystem";
         working_directory = "${config.services.loki.dataDir}/retention";
       };
@@ -312,6 +349,18 @@ in
         perms = "0644";
         reloadOrRestartUnits = [ "nginx.service" ];
       }
+      {
+        contents = ''
+          {{- with secret "mx.kaareskovgaard.net/data/users/monitoring" -}}
+          {{ .Data.data.password }}
+          {{- end -}}
+        '';
+        destination = smtpPasswordFile;
+        owner = "grafana";
+        group = "grafana";
+        perms = "0600";
+        reloadOrRestartUnits = [ "grafana.service" ];
+      }
     ];
     infrastructure.kanidm-client-application = {
       enable = true;
@@ -319,6 +368,11 @@ in
       secretOwner = "grafana";
       reloadOrRestartUnits = [ "grafana.service" ];
     };
+    infrastructure.vault-server-approle.policy = {
+      "mx.kaareskovgaard.net/data/users/monitoring" = {
+        capabilities = [ "read" ];
+      };
+    };
   };
   khscodes.networking.fqdn = "monitoring.kaareskovgaard.net";
   system.stateVersion = "25.05";