add some logging in

libraries/metrics/metrics.coffee

@@ -19,15 +19,19 @@ module.exports = Metrics =
 	initialize: (_name) ->
 		appname = _name
 		collectDefaultMetrics({ timeout: 5000, prefix: Metrics.buildPromKey()})
-		
+
+		logger.log("ENABLE_TRACE_AGENT set to #{process.env['ENABLE_TRACE_AGENT']}")
 		if process.env['ENABLE_TRACE_AGENT'] == "true"
+			logger.log("starting google trace agent")
 			traceAgent = require('@google-cloud/trace-agent')
 
 			traceOpts =
 				ignoreUrls: [/^\/status/, /^\/health_check/] 
 			traceAgent.start(traceOpts)
 
+		logger.log("ENABLE_DEBUG_AGENT set to #{process.env['ENABLE_DEBUG_AGENT']}")
 		if process.env['ENABLE_DEBUG_AGENT'] == "true"
+			logger.log("starting google debug agent")
 			debugAgent = require('@google-cloud/debug-agent')
 			debugAgent.start({
 				serviceContext: {