added support for debian buster

tasks/main.yml

@@ -9,7 +9,7 @@
 - name: generate pg_hba
   template:
     src: pg_hba.conf.j2
-    dest: /etc/postgresql/9.6/main/pg_hba.conf
+    dest: "/etc/postgresql/{{ pg_version }}/main/pg_hba.conf"
     owner: postgres
     group: postgres
     mode: 0640

vars/main.yml

@@ -2,3 +2,5 @@ monitoring:
   checks:
     local:
       mk_postgres: {}
+
+pg_version: "{% if ansible_distribution_release  == 'stretch' %}9.6{% endif %}{% if ansible_distribution_release  == 'buster' %}11{% endif %}"