Add variable mysql_performance_schema and configuration in evolinux_custom template

mysql/defaults/main.yml

@@ -48,6 +48,8 @@ mysql_evolinux_custom_file: zzz-evolinux-custom.cnf
 
 mysql_restart_if_needed: True
 
+mysql_performance_schema: True
+
 # replication variables:
 mysql_replication: false
 mysql_log_bin: null

mysql/templates/evolinux-custom.cnf.j2

@@ -39,3 +39,9 @@ lower_case_table_names = {{ mysql_lower_case_table_names }}
 innodb_log_file_size = {{ mysql_innodb_log_file_size }}
 {% endif %}
 read_only = {{ mysql_read_only }}
+{% if mysql_performance_schema %}
+performance_schema = ON
+performance-schema-instrument='stage/%=ON'
+performance-schema-consumer-events-stages-current=ON
+performance-schema-consumer-events-stages-history=ON
+{% endif %}