fix(collector): print the real hostname if an error happens

Author: gergelyke

lib/agent/api/index.js

@@ -79,7 +79,7 @@ CollectorApi.prototype._send = function (destinationUrl, data) {
   debug('sending data to trace servers: ', destinationUrl, payload)
 
   req.on('error', function (error) {
-    console.error('error: [trace]', 'There was an error connecting to the Trace servers. Make sure your servers can reach trace-collector-api.risingstack.com')
+    console.error('error: [trace]', 'There was an error connecting to the Trace servers. Make sure your servers can reach', opts.hostname)
     debug('error connecting to the Trace servers', error)
   })
   req.write(payload)
@@ -237,7 +237,7 @@ CollectorApi.prototype.getService = function (cb) {
   debug('getting serviceKey with payload:', payload)
 
   req.on('error', function (error) {
-    console.error('error: [trace]', 'There was an error connecting to the Trace servers. Make sure your servers can reach trace-collector-api.risingstack.com')
+    console.error('error: [trace]', 'There was an error connecting to the Trace servers. Make sure your servers can reach', opts.hostname)
     debug('error connecting to the Trace servers', error)
   })
   req.write(payload)