PMM-7: Improve ps setup with userstat

pmm_qa/percona_server/data/my-async-replication.cnf.j2

@@ -3,6 +3,7 @@
 server_id={{ item }}
 bind-address=0.0.0.0
 port={{ mysql_listen_port }}
+userstat=1
 
 # Authentication settings for caching_sha2_password
 caching_sha2_password_auto_generate_rsa_keys=ON

pmm_qa/percona_server/data/my.cnf.j2

@@ -0,0 +1,2 @@
+[mysqld]
+userstat=1

pmm_qa/percona_server/my.cnf.j2

@@ -3,6 +3,7 @@
 server_id={{ server_id_start + item - 1 }}
 bind-address=0.0.0.0
 port={{ mysql_listen_port }}
+userstat=1
 
 # General replication settings
 gtid_mode=ON
@@ -42,4 +43,3 @@ relay_log_purge=ON
 # Performance and connection settings
 max_connections=1000
 innodb_buffer_pool_size=256M
-

pmm_qa/percona_server/tasks/percona-server-setup.yml

@@ -1,3 +1,9 @@
+- name: Generate my.cnf for each node
+  template:
+    src: ./data/my.cnf.j2
+    dest: "{{ data_dir }}/node{{ item }}/my.cnf"
+  loop: "{{ range(1, nodes_count | int + 1) | list }}"
+
 - name: Start Percona Server containers
   community.docker.docker_container:
     name: "ps_pmm_{{ ps_version }}_{{ item }}"
@@ -12,6 +18,7 @@
       - "{{ mysql_port + item - 1 }}:{{ mysql_listen_port }}"
       - "{{ group_seeds_port + item - 1 }}:{{ group_seeds_port }}"
     volumes:
+      - "{{ data_dir }}/node{{ item }}/my.cnf:/etc/mysql/my.cnf"
       - "{{ data_dir }}/node{{ item }}/data:/var/lib/mysql"
   loop: "{{ range(1, nodes_count | int + 1) | list }}"