[master] bec707045 Make a note of the under-breeding issue

[Dridi Boukelmoune]

commit bec7070455c87b2173cc94b320bb3a7a1ee3fb60
Author: Dridi Boukelmoune <dridi.boukelmoune at gmail.com>
Date:   Mon Nov 18 15:36:55 2019 +0100

    Make a note of the under-breeding issue

diff --git a/bin/varnishtest/tests/c00096.vtc b/bin/varnishtest/tests/c00096.vtc
index 6c1ca372a..31443ac1e 100644
--- a/bin/varnishtest/tests/c00096.vtc
+++ b/bin/varnishtest/tests/c00096.vtc
@@ -42,6 +42,10 @@ varnish v1 -vcl+backend {
 	}
 } -start
 
+# XXX: there is a bug in the pool_herder logic that could
+# lead to over-breeding of threads resulting in more than
+# 10 threads. This is currently mitigated by increasing the
+# thread_pool_add_delay parameter.
 varnish v1 -expect MAIN.threads == 10
 
 client c1 {