From a78652cde3baf735fb631d9689af4f1b9cdc8fd4 Mon Sep 17 00:00:00 2001
From: Alex Bozhenko <alexbozhenko@gmail.com>
Date: Mon, 27 Oct 2025 18:58:08 -0700
Subject: [PATCH] add warning about legacy snapshot

Signed-off-by: Alex Bozhenko <alexbozhenko@gmail.com>
---
 server/jetstream_cluster.go | 1 +
 1 file changed, 1 insertion(+)

diff --git a/server/jetstream_cluster.go b/server/jetstream_cluster.go
index 5b45b679d83..61d1db472be 100644
--- a/server/jetstream_cluster.go
+++ b/server/jetstream_cluster.go
@@ -8775,6 +8775,7 @@ func (mset *stream) stateSnapshotLocked() []byte {
 		Deleted:  state.Deleted,
 	}
 	b, _ := json.Marshal(snap)
+	mset.srv.RateLimitWarnf("Stream %q: Using legacy JSON snapshot format. Snapshot length: %d bytes", mset.cfg.Name, len(b))
 	return b
 }