(Doc+) Videos of rejected requests (elastic#119311) (elastic#119327)

* (Doc+) Videos of rejected requests

Author: stefnestor

docs/reference/troubleshooting/common-issues/circuit-breaker-errors.asciidoc

@@ -9,6 +9,9 @@ By default, the <<parent-circuit-breaker,parent circuit breaker>> triggers at
 95% JVM memory usage. To prevent errors, we recommend taking steps to reduce
 memory pressure if usage consistently exceeds 85%.
 
+See https://www.youtube.com/watch?v=k3wYlRVbMSw[this video] for a walkthrough
+of diagnosing circuit breaker errors.
+
 [discrete]
 [[diagnose-circuit-breaker-errors]]
 ==== Diagnose circuit breaker errors

docs/reference/troubleshooting/common-issues/rejected-requests.asciidoc

@@ -32,6 +32,9 @@ correlating log as `EsRejectedExecutionException` with either
 
 These errors are often related to <<task-queue-backlog,backlogged tasks>>.
 
+See https://www.youtube.com/watch?v=auZJRXoAVpI[this video] for a walkthrough
+of troubleshooting threadpool rejections.
+
 [discrete]
 [[check-circuit-breakers]]
 ==== Check circuit breakers
@@ -47,6 +50,9 @@ GET /_nodes/stats/breaker
 These statistics are cumulative from node startup. For more information, see
 <<circuit-breaker,circuit breaker errors>>.
 
+See https://www.youtube.com/watch?v=k3wYlRVbMSw[this video] for a walkthrough
+of diagnosing circuit breaker errors.
+
 [discrete]
 [[check-indexing-pressure]]
 ==== Check indexing pressure
@@ -69,6 +75,9 @@ These errors are often related to <<task-queue-backlog,backlogged tasks>>,
 <<docs-bulk,bulk index>> sizing, or the ingest target's
 <<index-modules,`refresh_interval` setting>>.
 
+See https://www.youtube.com/watch?v=QuV8QqSfc0c[this video] for a walkthrough
+of diagnosing indexing pressure rejections.
+
 [discrete]
 [[prevent-rejected-requests]]
 ==== Prevent rejected requests