From fe5503a64019f6b39acbcc607bd9dec5c8edf41a Mon Sep 17 00:00:00 2001
From: John Sully <john@csquare.ca>
Date: Thu, 7 Mar 2024 20:27:29 +0000
Subject: [PATCH] Emit maxstorage metric

---
 src/modules/keydb_modstatsd/modmain.cpp | 1 +
 src/server.cpp                          | 6 ++++--
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/modules/keydb_modstatsd/modmain.cpp b/src/modules/keydb_modstatsd/modmain.cpp
index 203dcdcdf..f6a5c0ee2 100644
--- a/src/modules/keydb_modstatsd/modmain.cpp
+++ b/src/modules/keydb_modstatsd/modmain.cpp
@@ -100,6 +100,7 @@ std::unordered_map<std::string, StatsRecord> g_mapInfoFields = {
     { "used_memory", { StatsD_Type::STATSD_GAUGE_BYTES, false /* prefixOnly */}},
     { "used_memory_rss", { StatsD_Type::STATSD_GAUGE_BYTES }},
     { "maxmemory", { StatsD_Type::STATSD_GAUGE_BYTES, false /* prefixOnly */}},
+    { "maxstorage", { StatsD_Type::STATSD_GAUGE_BYTES, false /* prefixOnly */}},
     { "used_memory_dataset_perc", { StatsD_Type::STATSD_GAUGE_FLOAT }},
     { "avg_lock_contention", { StatsD_Type::STATSD_GAUGE_LONGLONG }},
     { "repl_backlog_size", { StatsD_Type::STATSD_GAUGE_BYTES }},
diff --git a/src/server.cpp b/src/server.cpp
index a14e4a9ce..e7ef53d23 100644
--- a/src/server.cpp
+++ b/src/server.cpp
@@ -5826,7 +5826,8 @@ sds genRedisInfoString(const char *section) {
             "lazyfree_pending_objects:%zu\r\n"
             "lazyfreed_objects:%zu\r\n"
             "storage_provider:%s\r\n"
-            "available_system_memory:%s\r\n",
+            "available_system_memory:%s\r\n"
+            "maxstorage:%llu\r\n",
             zmalloc_used,
             hmem,
             g_pserver->cron_malloc_stats.process_rss,
@@ -5872,7 +5873,8 @@ sds genRedisInfoString(const char *section) {
             lazyfreeGetPendingObjectsCount(),
             lazyfreeGetFreedObjectsCount(),
             g_pserver->m_pstorageFactory ? g_pserver->m_pstorageFactory->name() : "none",
-            available_system_mem
+            available_system_mem,
+            g_pserver->maxstorage
         );
         freeMemoryOverheadData(mh);
     }