Remove monit from our deployment

Okay well, we added monit to solve a problem that I coincidentally solved within an hour of getting monit working lol!

This also enables us to remove the pm2 pid file, which we were only using to allow monit to track the pm2 app.

deploy/playbooks/setup.yml

@@ -78,10 +78,6 @@
                 args: "start --port=3000",
                 instances: "max",
                 exec_mode: "cluster",
-                // We add `app` to the end of the filename, to avoid a pm2
-                // bug that changes the filename:
-                // https://github.com/Unitech/pm2/issues/5218#issue-1044210369
-                pid_file: "/home/{{ ansible_user_id }}/impress-2020-app.pid",
               }
             ]
           }
@@ -160,59 +156,6 @@
       notify:
         - Restart nginx
 
-    - name: Install monit
-      become: yes
-      apt:
-        update_cache: yes
-        name: monit
-
-    - name: Add monit config file for global settings
-      become: yes
-      copy:
-        content: |
-          # TODO: Add email monitoring (requires SMTP config)
-
-          # This lets us call `sudo monit status` from the command line.
-          # Without this, the `monit` command can't find the running service.
-          set pidfile /var/run/monit.pid
-
-          # This enables Monit's HTTP server, but only locally, which is
-          # required for calling `sudo monit status` from the command line.
-          set httpd port 2812 and
-            use address localhost
-            allow localhost
-        dest: /etc/monit/conf-enabled/global-config
-      notify:
-        - Restart monit
-
-    - name: Add monit config to watch our pm2 app
-      become: yes
-      copy:
-        content: |
-          check process impress-2020-as-{{ ansible_user_id }} with pidfile /home/{{ ansible_user_id }}/impress-2020-app-0.pid
-            start program = "/bin/pm2 start impress-2020" as uid "{{ ansible_user_id }}"
-            stop program = "/bin/pm2 stop impress-2020" as uid "{{ ansible_user_id }}"
-            restart program = "/bin/pm2 reload impress-2020" as uid "{{ ansible_user_id }}"
-            if failed port 3000 protocol http then restart
-            if 5 restarts within 5 cycles then alert
-        dest: "/etc/monit/conf-enabled/pm2-as-{{ ansible_user_id }}"
-      notify:
-        - Reload monit
-
-    - name: Add monit config to watch nginx
-      become: yes
-      copy:
-        content: |
-          check process nginx with pidfile /var/run/nginx.pid
-            start program = "/bin/systemctl start nginx"
-            stop program = "/bin/systemctl stop nginx"
-            restart program = "/bin/systemctl restart nginx"
-            if failed host impress-2020-box.openneo.net port 443 type tcpssl protocol http then restart
-            if 5 restarts within 5 cycles then alert
-        dest: "/etc/monit/conf-enabled/nginx"
-      notify:
-        - Reload monit
-
     - name: Install dependencies for the npm module node-canvas
       become: yes
       apt:
@@ -231,13 +174,3 @@
       systemd:
         name: nginx
         state: restarted
-    - name: Restart monit
-      become: yes
-      systemd:
-        name: monit
-        state: restarted
-    - name: Reload monit
-      become: yes
-      systemd:
-        name: monit
-        state: reloaded