agent.rb in instana-1.7.13

- old
+ new

@@ -370,12 +370,12 @@
       Instana.logger.debug e.backtrace.join("\r\n") unless ::Instana.test?
       return false
     end
 
     # Runs a discovery process to determine where we can contact the host agent.  This is usually just
-    # localhost but in docker can be found on the default gateway.  This also allows for manual
-    # configuration via ::Instana.config[:agent_host/port].
+    # localhost but in docker can be found on the default gateway. Another option is the INSTANA_AGENT_HOST
+    # environment variable. This also allows for manual configuration via ::Instana.config[:agent_host/port].
     #
     # @return [Hash] a hash with :agent_host, :agent_port values or empty hash
     #
     def run_discovery
       discovered = {}
@@ -412,9 +412,10 @@
         discovered[:agent_host] = @default_gateway
         discovered[:agent_port] = ::Instana.config[:agent_port]
         ::Instana.logger.debug "#{__method__}: Found #{discovered[:agent_host]}:#{discovered[:agent_port]}"
         return discovered
       end
+
       nil
     end
 
     # Returns the PID that we are reporting to
     #