netdata: monitor pve01, alert #réseau over IRC, store more metrics (~2GiB)

machines/core-services-01/monitoring.nix

@@ -6,6 +6,54 @@ in
 {
   services.netdata.enable = true;
 
+  systemd.services.netdata.restartTriggers = map (v: config.environment.etc."netdata/${v}.conf".source) [
+    "netdata"
+    "stream"
+    "health_alarm_notify"
+  ];
+
+  environment.etc."netdata/netdata.conf" = {
+    user = "netdata";
+    group = "netdata";
+    mode = "0600";
+    text = ''
+      [global]
+      page cache size = 32
+      dbengine multihost disk space = 2048
+    '';
+  };
+
+  environment.etc."netdata/stream.conf" = {
+    user = "netdata";
+    group = "netdata";
+    mode = "0600";
+    text = ''
+      [e245097d-bf52-4f66-9c10-984e8d5ee178]
+        enabled = yes
+        default history = 5000
+        default memory mode = dbengine
+        health enabled by default = auto
+        allow from = 10.1.1.10
+    '';
+  };
+
+  environment.etc."netdata/health_alarm_notify.conf" = {
+    user = "netdata";
+    group = "netdata";
+    mode = "0600";
+    text = ''
+      # External tools
+      nc="${pkgs.netcat}/bin/nc"
+
+      # IRC configuration
+      SEND_IRC="YES"
+      DEFAULT_RECIPIENT_IRC="#réseau"
+      IRC_NETWORK="ens.wtf"
+      IRC_NICKNAME="core-services-01"
+      IRC_REALNAME="KlubRZ Core Services 01"
+    '';
+  };
+
   services.oauth2_proxy = {
     enable = true;
     keyFile = config.age.secrets.oauth2ProxyKeyFile.path;