From 2ba36ee04c5e37eef60cb5a724949953592e97df Mon Sep 17 00:00:00 2001
From: Jon Chambers <jon@signal.org>
Date: Sat, 3 Oct 2020 10:41:42 -0400
Subject: [PATCH] Add a gauge for worker thread liveness.

---
 .../whispersystems/textsecuregcm/storage/MessagePersister.java  | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/service/src/main/java/org/whispersystems/textsecuregcm/storage/MessagePersister.java b/service/src/main/java/org/whispersystems/textsecuregcm/storage/MessagePersister.java
index 44c242c5e..0ff36ea2b 100644
--- a/service/src/main/java/org/whispersystems/textsecuregcm/storage/MessagePersister.java
+++ b/service/src/main/java/org/whispersystems/textsecuregcm/storage/MessagePersister.java
@@ -65,6 +65,8 @@ public class MessagePersister implements Managed {
                 }
             }
         });
+
+        metricRegistry.gauge(name(getClass(), "workerThreadRunning"), () -> () -> workerThread.isAlive() ? 1 : 0);
     }
 
     @VisibleForTesting