[Messenger] Add jitter parameter to MultiplierRetryStrategy

Author: rmikalkenas

messenger.rst

@@ -986,6 +986,8 @@ this is configurable for each transport:
                             # e.g. 1 second delay, 2 seconds, 4 seconds
                             multiplier: 2
                             max_delay: 0
+                            # applies randomness to the delay that can prevent the thundering herd effect
+                            jitter: 0.1
                             # override all of this with a service that
                             # implements Symfony\Component\Messenger\Retry\RetryStrategyInterface
                             # service: null
@@ -1005,7 +1007,7 @@ this is configurable for each transport:
             <framework:config>
                 <framework:messenger>
                     <framework:transport name="async_priority_high" dsn="%env(MESSENGER_TRANSPORT_DSN)%?queue_name=high_priority">
-                        <framework:retry-strategy max-retries="3" delay="1000" multiplier="2" max-delay="0"/>
+                        <framework:retry-strategy max-retries="3" delay="1000" multiplier="2" max-delay="0" jitter="0.1"/>
                     </framework:transport>
                 </framework:messenger>
             </framework:config>
@@ -1030,6 +1032,8 @@ this is configurable for each transport:
                     // e.g. 1 second delay, 2 seconds, 4 seconds
                     ->multiplier(2)
                     ->maxDelay(0)
+                    // applies randomness to the delay that can prevent the thundering herd effect
+                    ->jitter(0.1)
                     // override all of this with a service that
                     // implements Symfony\Component\Messenger\Retry\RetryStrategyInterface
                     ->service(null)