enhancement(prometheus): supports multiple web listen addresses in preflight

this is for consistency with the other roles' preflight asserts for when
prometheus itself finally supports multiple web listen addresses

Signed-off-by: Christian Krause <christian.krause@idiv.de>

roles/prometheus/molecule/alternative/molecule.yml

@@ -86,5 +86,5 @@ provisioner:
                 target_label: instance
               - target_label: __address__
                 replacement: 127.0.0.1:9115  # Blackbox exporter.
-        version: 2.25.2
+        prometheus_version: 2.25.2
         prometheus_stop_timeout: 1min

roles/prometheus/molecule/alternative/prepare.yml

@@ -6,9 +6,9 @@
     - name: Download prometheus binary to local folder
       become: false
       ansible.builtin.get_url:
-        url: "https://github.com/prometheus/prometheus/releases/download/v{{ version\
-          \ }}/prometheus-{{ version }}.linux-amd64.tar.gz"
-        dest: "/tmp/prometheus-{{ version }}.linux-amd64.tar.gz"
+        url: "https://github.com/prometheus/prometheus/releases/download/v{{ prometheus_version\
+          \ }}/prometheus-{{ prometheus_version }}.linux-amd64.tar.gz"
+        dest: "/tmp/prometheus-{{ prometheus_version }}.linux-amd64.tar.gz"
         mode: 0644
       register: _download_archive
       until: _download_archive is succeeded
@@ -19,15 +19,15 @@
     - name: Unpack prometheus binaries
       become: false
       ansible.builtin.unarchive:
-        src: "/tmp/prometheus-{{ version }}.linux-amd64.tar.gz"
+        src: "/tmp/prometheus-{{ prometheus_version }}.linux-amd64.tar.gz"
         dest: "/tmp"
-        creates: "/tmp/prometheus-{{ version }}.linux-amd64/prometheus"
+        creates: "/tmp/prometheus-{{ prometheus_version }}.linux-amd64/prometheus"
       check_mode: false
 
     - name: Link to prometheus binaries directory
       become: false
       ansible.builtin.file:
-        src: "/tmp/prometheus-{{ version }}.linux-amd64"
+        src: "/tmp/prometheus-{{ prometheus_version }}.linux-amd64"
         dest: "/tmp/prometheus-linux-amd64"
         state: link
       check_mode: false

roles/prometheus/molecule/alternative/tests/test_alternative.py

@@ -65,6 +65,8 @@ def test_service(host):
         raise  # Re-raise the original assertion error
 
 
-def test_socket(host):
-    s = host.socket("tcp://127.0.0.1:9090")
-    assert s.is_listening
+@pytest.mark.parametrize("sockets", [
+    "tcp://127.0.0.1:9090",
+])
+def test_socket(host, sockets):
+    assert host.socket(sockets).is_listening

roles/prometheus/tasks/preflight.yml

@@ -20,6 +20,22 @@
   ansible.builtin.package_facts:
   when: "not 'packages' in ansible_facts"
 
+- name: Assert that used version supports listen address type
+  ansible.builtin.assert:
+    that:
+      - >-
+        prometheus_web_listen_address is string
+
+- name: Naive assertion of proper listen address
+  ansible.builtin.assert:
+    that:
+      - >-
+        [prometheus_web_listen_address] |
+          flatten |
+          reject('match', '.+:\\d+$') |
+          list |
+          length == 0
+
 - name: Assert no duplicate config flags
   ansible.builtin.assert:
     that: