Add support for exposing metrics for Synapse workers

roles/custom/matrix-synapse/tasks/synapse/workers/setup_install.yml

@@ -40,6 +40,20 @@
   with_items: "{{ matrix_synapse_workers_current_systemd_services.files }}"
   when: "not ansible_check_mode and (item.path | basename | replace('.service', '')) not in matrix_synapse_enabled_worker_names"
 
+- name: Determine current worker label files
+  ansible.builtin.find:
+    path: "{{ matrix_synapse_base_path }}"
+    patterns: "worker.*.labels"
+    use_regex: true
+  register: matrix_synapse_workers_current_label_files
+
+- name: Ensure unnecessary worker labels are cleaned
+  ansible.builtin.file:
+    path: "{{ item.path }}"
+    state: absent
+  with_items: "{{ matrix_synapse_workers_current_label_files.files }}"
+  when: "not ansible_check_mode and (item.path | basename | replace ('worker.', '') | replace('.labels', '')) not in matrix_synapse_enabled_worker_names"
+
 - name: Ensure creation of worker systemd service files and configuration files
   ansible.builtin.include_tasks: "{{ role_path }}/tasks/synapse/workers/util/setup_files_for_worker.yml"
   with_items: "{{ matrix_synapse_workers_enabled_list }}"

roles/custom/matrix-synapse/tasks/synapse/workers/util/setup_files_for_worker.yml

@@ -4,6 +4,7 @@
     matrix_synapse_worker_systemd_service_name: "{{ matrix_synapse_worker_details.name }}"
     matrix_synapse_worker_container_name: "{{ matrix_synapse_worker_details.name }}"
     matrix_synapse_worker_config_file_name: "worker.{{ matrix_synapse_worker_details.name }}.yaml"
+    matrix_synapse_worker_labels_file_name: "worker.{{ matrix_synapse_worker_details.name }}.labels"
 
 - name: Ensure configuration exists for {{ matrix_synapse_worker_systemd_service_name }}
   ansible.builtin.template:
@@ -13,6 +14,14 @@
     owner: "{{ matrix_synapse_uid }}"
     group: "{{ matrix_synapse_gid }}"
 
+- name: Ensure labels exists for {{ matrix_synapse_worker_systemd_service_name }}
+  ansible.builtin.template:
+    src: "{{ role_path }}/templates/synapse/worker-labels.j2"
+    dest: "{{ matrix_synapse_base_path }}/{{ matrix_synapse_worker_labels_file_name }}"
+    mode: 0644
+    owner: "{{ matrix_synapse_uid }}"
+    group: "{{ matrix_synapse_gid }}"
+
 - name: Ensure systemd service exists for {{ matrix_synapse_worker_systemd_service_name }}
   ansible.builtin.template:
     src: "{{ role_path }}/templates/synapse/systemd/matrix-synapse-worker.service.j2"