PMM-9315 Modify nginx config files instead of replacing

build/ansible/roles/loki/files/json_log_format.conf

@@ -0,0 +1,12 @@
+        'time="$time_iso8601" '
+        'host=$http_host '
+        'remote_addr=$remote_addr '
+        'request_method=$request_method '
+        'request="$request_uri" '
+        'request_time=$request_time '
+        'body_bytes_sent=$body_bytes_sent '
+        'server_protocol="$server_protocol" '
+        'status=$status '
+        'http_referrer="$http_referer" '
+        'http_x_forwarded_for="$http_x_forwarded_for" '
+        'http_user_agent="$http_user_agent"';

build/ansible/roles/loki/files/loki_location.conf

@@ -0,0 +1,7 @@
+    # Loki
+    location = /loki/api/v1/push {
+      proxy_pass http://127.0.0.1:3100/$request_uri;
+      proxy_read_timeout 600;
+      proxy_set_header Connection "";
+      client_body_buffer_size 2m;
+    }

build/ansible/roles/loki/tasks/main.yml

@@ -69,16 +69,32 @@
     owner: pmm
     group: pmm
 
-- name: Override pmm.conf file
-  copy:
-    src: pmm.conf
-    dest: /etc/nginx/conf.d/pmm.conf
-    owner: pmm
-    group: pmm
+- name: Remove the end of log_format line in nginx.conf
+  command: sed -i 's/^\([[:space:]]*log_format  main\).*/\1/' /etc/nginx/nginx.conf
 
-- name: Override nginx.conf file
-  copy:
-    src: nginx.conf
-    dest: /etc/nginx/nginx.conf
-    owner: pmm
-    group: pmm
+- name: Remove the log_format in nginx.conf
+  command: sed -i '/log_format/{n;N;d;}' /etc/nginx/nginx.conf
+
+- name: Replace the original log_format with a json one
+  blockinfile:
+    path: /etc/nginx/nginx.conf
+    marker: "{mark}"
+    marker_begin: "#LOG_FORMAT_BEGIN"
+    marker_end: "#LOG_FORMAT_END"
+    insertafter: "log_format"
+    block: "{{ lookup('ansible.builtin.file', '/opt/ansible/roles/loki/files/json_log_format.conf') }}"
+
+- name: Remove ansible markers from nginx.conf
+  command: sed -i '/^#LOG_FORMAT_.*/d' /etc/nginx/nginx.conf
+
+- name: Add Loki location to pmm.conf
+  blockinfile:
+    path: /etc/nginx/conf.d/pmm.conf
+    marker: "{mark}"
+    marker_begin: "#LOKI_LOCATION_BEGIN"
+    marker_end: "#LOKI_LOCATION_END"
+    insertbefore: "# Swagger UI"
+    block: "{{ lookup('ansible.builtin.file', '/opt/ansible/roles/loki/files/loki_location.conf') }}"
+
+- name: Remove ansible markers from pmm.conf
+  command: sed -i '/^#LOKI_LOCATION_.*/d'/etc/nginx/conf.d/pmm.conf