Add Alerta plugins

Change-Id: If8bd0799efc02f51b0accef79b23ce07bffe9a6b

alerta/Dockerfile

@@ -31,6 +31,7 @@ RUN apt-get -y update && apt-get -y upgrade && apt-get -y install --no-install-r
             curl \
             wget \
             gcc \
+            git \
             python3.7 \
             python3-pip \
             python3-venv \
@@ -65,6 +66,10 @@ RUN pip3 --no-cache-dir install pip virtualenv && \
 ENV PATH $PATH:/venv/bin
 
 RUN /venv/bin/pip --no-cache-dir install alerta==${CLIENT_VERSION} alerta-server==${SERVER_VERSION}
+COPY install-plugins.sh /app/install-plugins.sh
+COPY plugins.txt /app/plugins.txt
+COPY alertad.conf /app/alertad.conf
+RUN /app/install-plugins.sh
 
 ENV ALERTA_SVR_CONF_FILE /app/alertad.conf
 ENV ALERTA_CONF_FILE /app/alerta.conf

alerta/alertad.conf

@@ -0,0 +1,3 @@
+DEBUG = True
+PLUGINS = ['enhance', 'forward', 'normalise', 'prometheus']
+ALERTMANAGER_SILENCE_FROM_ACK = True

alerta/install-plugins.sh

@@ -0,0 +1,6 @@
+#!/bin/bash
+
+while read plugin version; do
+  echo "Installing '${plugin}' (${version})"
+  /venv/bin/pip --no-cache-dir install git+https://github.com/alerta/alerta-contrib.git@${version}#subdirectory=${plugin}
+done </app/plugins.txt

alerta/plugins.txt

@@ -0,0 +1,4 @@
+plugins/enhance master
+plugins/forward master
+plugins/normalise master
+plugins/prometheus master