refactor: Use haumea for filesystem-based module system for flake outputs

refactor: Use hyphen(`-`) for variable names & folder names(except Python), replace all unserscore(`_`) with hyphen(`-`).

hosts/idols-ruby/grafana/dashboards.yml

@@ -0,0 +1,20 @@
+apiVersion: 1
+
+providers:
+  # <string> an unique provider name. Required
+  - name: 'Dashboards'
+    # <int> Org id. Default to 1
+    orgId: 1
+    # <string> provider type. Default to 'file'
+    type: file
+    # <bool> disable dashboard deletion
+    disableDeletion: false
+    # <int> how often Grafana will scan for changed dashboards
+    updateIntervalSeconds: 20
+    # <bool> allow updating provisioned dashboards from the UI
+    allowUiUpdates: false
+    options:
+      # <string, required> path to dashboard files on disk. Required when using the 'file' type
+      path: /etc/grafana/dashboards
+      # <bool> use folder names from filesystem to create folders in Grafana
+      foldersFromFilesStructure: true

hosts/idols-ruby/grafana/dashboards/README.md

@@ -0,0 +1,11 @@
+# Grafana Dashbaords
+
+## Homelab
+
+1. https://grafana.com/grafana/dashboards/1860-node-exporter-full/
+2. https://grafana.com/grafana/dashboards/9578-alertmanager/
+
+## Kubernetes
+
+1. https://github.com/dotdc/grafana-dashboards-kubernetes/
+

hosts/idols-ruby/grafana/datasources.yml

@@ -0,0 +1,21 @@
+# https://grafana.com/docs/grafana/latest/datasources/prometheus/
+apiVersion: 1
+
+datasources:
+  - name: prometheus-homelab
+    type: prometheus
+    access: proxy
+    # Access mode - proxy (server in the UI) or direct (browser in the UI).
+    url: http://localhost:9090
+    jsonData:
+      httpMethod: POST
+      manageAlerts: true
+      prometheusType: Prometheus
+      prometheusVersion: 2.49.0
+      cacheLevel: 'High'
+      disableRecordingRules: false
+      # As of Grafana 10, the Prometheus data source can be configured to query live dashboards 
+      # incrementally, instead of re-querying the entire duration on each dashboard refresh.
+      # Increasing the duration of the incrementalQueryOverlapWindow will increase the size of every incremental query, 
+      # but might be helpful for instances that have inconsistent results for recent data.
+      incrementalQueryOverlapWindow: 10m

hosts/idols-ruby/grafana/default.nix

@@ -0,0 +1,52 @@
+{
+  config,
+  myvars,
+  ...
+}: {
+  services.grafana = {
+    enable = true;
+    dataDir = "/var/lib/grafana";
+    # DeclarativePlugins = with pkgs.grafanaPlugins; [ grafana-piechart-panel ];
+    settings = {
+      server = {
+        http_addr = "127.0.0.1";
+        http_port = 3000;
+        protocol = "http";
+        domain = "grafana.writefo.fun";
+        # Redirect to correct domain if the host header does not match the domain. Prevents DNS rebinding attacks.
+        serve_from_sub_path = false;
+        # Add subpath to the root_url if serve_from_sub_path is true
+        root_url = "%(protocol)s://%(domain)s:%(http_port)s/";
+        enforce_domain = false;
+        read_timeout = "180s";
+        # Enable HTTP compression, this can improve transfer speed and bandwidth utilization.
+        enable_gzip = true;
+        # Cdn for accelerating loading of frontend assets.
+        # cdn_url = "https://cdn.jsdelivr.net/npm/grafana@7.5.5";
+      };
+
+      security = {
+        admin_user = myvars.username;
+        admin_email = myvars.useremail;
+        # Use file provider to read the admin password from a file.
+        # https://grafana.com/docs/grafana/latest/setup-grafana/configure-grafana/#file-provider
+        admin_password = "$__file{${config.age.secrets."grafana-admin-password".path}}";
+      };
+      users = {
+        allow_sign_up = false;
+        # home_page = "";
+        default_theme = "dark";
+      };
+    };
+
+    # Declaratively provision Grafana's data sources, dashboards, and alerting rules.
+    # Grafana's alerting rules is not recommended to use, we use Prometheus alertmanager instead.
+    # https://grafana.com/docs/grafana/latest/administration/provisioning/#data-sources
+    provision = {
+      datasources.path = ./datasources.yml;
+      dashboards.path = ./dashboards.yml;
+    };
+  };
+
+  environment.etc."grafana/dashboards".source = ./dashboards;
+}