add appmetrics instrumentation and install appmetrics-dash

Author: janvda

node-red-test/Dockerfile

@@ -9,6 +9,10 @@ RUN npm install node-red-contrib-resinio
 RUN npm install node-red-dashboard
 RUN npm install node-red-contrib-credentials
 RUN npm install appmetrics
+RUN npm install appmetrics-dash
 
 COPY ./settings.js /data/settings.js
-COPY ./appmetrics.properties /usr/src/node-red/node_modules/appmetrics/appmetrics.properties
+COPY ./appmetrics.properties /usr/src/node-red/node_modules/appmetrics/appmetrics.properties
+
+# following command will add instrumentation to Node.js (= node-red)
+RUN sed -i 's?#!/usr/bin/env node?#!/usr/bin/env node;\n\n/* JVA: adding appmetrics instructions*/\nvar appmetrics = require("appmetrics");\nvar monitoring = appmetrics.monitor();\n?' /usr/src/node-red/node_modules/node-red/red.js