From 433197bf2b2d04e49b1bab67984d84eda0f828cc Mon Sep 17 00:00:00 2001
From: hc-github-team-secure-vault-core
 <82990506+hc-github-team-secure-vault-core@users.noreply.github.com>
Date: Thu, 15 Jun 2023 11:53:16 -0400
Subject: [PATCH] backport of commit 6b87a087afe24e8bd52a2b9ada4b506b20d4fc7e
 (#21254)

Co-authored-by: Nick Cabatoff <ncabatoff@hashicorp.com>
---
 changelog/21249.txt   |  3 +++
 physical/raft/raft.go | 15 ++++++++++-----
 2 files changed, 13 insertions(+), 5 deletions(-)
 create mode 100644 changelog/21249.txt

diff --git a/changelog/21249.txt b/changelog/21249.txt
new file mode 100644
index 000000000..a088677ad
--- /dev/null
+++ b/changelog/21249.txt
@@ -0,0 +1,3 @@
+```release-note:bug
+core: Fix panic in sealed nodes using raft storage trying to emit raft metrics
+```
diff --git a/physical/raft/raft.go b/physical/raft/raft.go
index 1060eda7a..fa98b4e6f 100644
--- a/physical/raft/raft.go
+++ b/physical/raft/raft.go
@@ -624,10 +624,13 @@ func (b *RaftBackend) DisableUpgradeMigration() (bool, bool) {
 }
 
 func (b *RaftBackend) CollectMetrics(sink *metricsutil.ClusterMetricSink) {
+	var stats map[string]string
 	b.l.RLock()
 	logstoreStats := b.stableStore.(*raftboltdb.BoltStore).Stats()
 	fsmStats := b.fsm.Stats()
-	stats := b.raft.Stats()
+	if b.raft != nil {
+		stats = b.raft.Stats()
+	}
 	b.l.RUnlock()
 	b.collectMetricsWithStats(logstoreStats, sink, "logstore")
 	b.collectMetricsWithStats(fsmStats, sink, "fsm")
@@ -637,10 +640,12 @@ func (b *RaftBackend) CollectMetrics(sink *metricsutil.ClusterMetricSink) {
 			Value: b.localID,
 		},
 	}
-	for _, key := range []string{"term", "commit_index", "applied_index", "fsm_pending"} {
-		n, err := strconv.ParseUint(stats[key], 10, 64)
-		if err == nil {
-			sink.SetGaugeWithLabels([]string{"raft_storage", "stats", key}, float32(n), labels)
+	if stats != nil {
+		for _, key := range []string{"term", "commit_index", "applied_index", "fsm_pending"} {
+			n, err := strconv.ParseUint(stats[key], 10, 64)
+			if err == nil {
+				sink.SetGaugeWithLabels([]string{"raft_storage", "stats", key}, float32(n), labels)
+			}
 		}
 	}
 }