rollout Alloy to replace prometheus_node_exporter

With the new network we need to deploy a push based solution in order to get metrics into prometheus

roles/alloy/defaults/main.yaml

@@ -0,0 +1,44 @@
+alloy_config_default: |
+  prometheus.remote_write "default" {
+    endpoint {
+      url = "https://metrics.hamburg.ccc.de/api/v1/write"
+      basic_auth {
+        username = "chaos"
+        password = "{{ metrics__chaos_password }}"
+      }
+    }
+  }
+
+  prometheus.relabel "chaosknoten_common" {
+    forward_to = [prometheus.remote_write.default.receiver]
+    rule {
+      target_label = "org"
+      replacement = "ccchh"
+    }
+    rule {
+      target_label = "site"
+      replacement = "wieske"
+    }
+    rule {
+      source_labels = ["instance"]
+      target_label = "instance"
+      regex  = "([^:]+)"
+      replacement = "${1}.hosts.hamburg.ccc.de"
+      action = "replace"
+    }
+  }
+
+  logging {
+    level = "info"
+  }
+
+  prometheus.exporter.unix "local_system" {
+    enable_collectors = ["systemd"]
+  }
+
+  prometheus.scrape "scrape_metrics" {
+    targets           = prometheus.exporter.unix.local_system.targets
+    forward_to        = [prometheus.relabel.chaosknoten_common.receiver]
+  }
+
+alloy_config_additional: ""

roles/alloy/tasks/main.yaml

@@ -45,4 +45,6 @@
 - name: Setup Alloy
   ansible.builtin.import_role:
     name: grafana.grafana.alloy
+  vars:
+    alloy_config: "{{ alloy_config_default ~ alloy_config_additional }}"
   become: true

roles/prometheus_node_exporter/meta/main.yaml

@@ -1,10 +0,0 @@
----
-dependencies:
-  - role: distribution_check
-    vars:
-      distribution_check__distribution_support_spec:
-        - name: Debian
-          major_versions:
-            - "11"
-            - "12"
-            - "13"

roles/prometheus_node_exporter/tasks/main.yaml

@@ -1,14 +0,0 @@
-- name: make sure the `prometheus-node-exporter` package is installed
-  ansible.builtin.apt:
-    name: prometheus-node-exporter
-    state: present
-    allow_change_held_packages: true
-    update_cache: true
-  become: true
-
-- name: make sure `prometheus-node-exporter.service` is started and ansibled
-  ansible.builtin.systemd:
-    name: prometheus-node-exporter.service
-    state: started
-    enabled: true
-  become: true