From 00aa26cd1a9da8d92068771bf9014836a928df52 Mon Sep 17 00:00:00 2001
From: Andrew Rumble <andrew.rumble@overleaf.com>
Date: Fri, 7 Mar 2025 15:48:06 +0000
Subject: [PATCH] Add a metric so that we can know maint is prevented

GitOrigin-RevId: a4df6ce7f22df01e1116ae9dbf5c7c7afc73c388
---
 services/clsi/app.js | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/services/clsi/app.js b/services/clsi/app.js
index f8db431f53..8715802a0e 100644
--- a/services/clsi/app.js
+++ b/services/clsi/app.js
@@ -309,6 +309,10 @@ const loadTcpServer = net.createServer(function (socket) {
     } else {
       // Ready will cancel the maint state.
       socket.write(`up, ready, ${Math.max(freeLoadPercentage, 1)}%\n`, 'ASCII')
+      if (freeLoadPercentage <= 0) {
+        // This metric records how often we would have gone into maintenance mode.
+        Metrics.inc('clsi-prevented-maint')
+      }
     }
     socket.end()
   } else {