Try using Redis for AMQP

Dockerfile

@@ -5,3 +5,5 @@ RUN /venv/bin/pip install dnspython==2.1.0
 RUN /venv/bin/pip install "git+https://github.com/alerta/alerta-contrib.git@856a900528711eca05ccc3586ffd1106e4d091e3#subdirectory=integrations/mailer"
 
 RUN /venv/bin/pip install "git+https://github.com/alerta/alerta-contrib.git@856a900528711eca05ccc3586ffd1106e4d091e3#subdirectory=plugins/rocketchat"
+
+RUN /venv/bin/pip install redis==3.5.3

alerta.conf.tmpl

@@ -8,7 +8,7 @@ timezone = Europe/London
 
 [alerta-mailer]
 amqp_topic = notify
-amqp_url = mongodb://{{ env "DB_HOST" }}/{{ env "DB_NAME" }}
+amqp_url = redis://{{ env "QUEUE_HOST" }}/
 config_file = /app/alerta.conf
 dashboard_url = https://{{ env "DOMAIN" }}
 debug = {{ env "DEBUG" }}

alertad.conf.tmpl

@@ -48,7 +48,7 @@ PLUGINS = [
     "rocketchat",
 ]
 
-AMQP_URL = "mongodb://{{ env "DB_HOST" }}/{{ env "DB_NAME" }}"
+AMQP_URL = "redis://{{ env "QUEUE_HOST" }}"
 AMQP_TOPIC = "notify"
 
 ROCKETCHAT_WEBHOOK_URL = "{{ secret "rocket_chat_webhook_url" }}"

compose.yml

@@ -21,6 +21,8 @@ x-secrets: &default-secrets
 
 x-environment: &default-env
   - ADMIN_USERS=${ADMIN_USERS}
+  - DB_HOST=db:27017
+  - DB_NAME=alerta
   - DEBUG=${DEBUG}
   - DOMAIN=${DOMAIN}
   - KEYCLOAK_REALM=${KEYCLOAK_REALM}
@@ -28,9 +30,8 @@ x-environment: &default-env
   - KEYCLOAK_URL=${KEYCLOAK_URL}
   - MAIL_FROM=${MAIL_FROM}
   - MAIL_TO=${MAIL_TO}
-  - DB_HOST=db:27017
-  - DB_NAME=alerta
   - OAUTH2_CLIENT_ID=${OAUTH2_CLIENT_ID}
+  - QUEUE_HOST=queue:6379
   - ROCKET_CHAT_ALERTA_USERNAME=${ROCKET_CHAT_ALERTA_USERNAME}
   - ROCKET_CHAT_CHANNEL=${ROCKET_CHAT_CHANNEL}
   - ROCKET_CHAT_ICON_EMOJI=${ROCKET_CHAT_ICON_EMOJI}
@@ -74,6 +75,13 @@ services:
     networks:
       - internal
 
+  queue:
+    image: "redis:6"
+    volumes:
+      - "redis:/data"
+    networks:
+      - internal
+
 networks:
   internal:
   proxy:
@@ -81,6 +89,7 @@ networks:
 
 volumes:
   mongodb:
+  redis:
 
 configs:
   config_json: