Note the SIGUSR1 addition that happened a while back

dda65673 · Hanno Schlichting · e73313de · dda65673
Commit dda65673 authored Jun 05, 2010 by Hanno Schlichting
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doc/SIGNALS.rst doc/SIGNALS.rst +3 -0

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--- a/doc/SIGNALS.rst
+++ b/doc/SIGNALS.rst
@@ -19,6 +19,9 @@ specified in the file '$INSTANCE_HOME/var/Z2.pid'::

    SIGINT  - same as SIGTERM

+    SIGUSR1 - dump a stack trace of all threads to stdout. This can help
+              diagnosing `stuck` Zope processes if all threads are stuck.
+
    SIGUSR2 - close and re-open all Zope log files (z2.log, event log,
              detailed log.) A common idiom after rotating Zope log files
              is: