common/Graylog: add missing include

Signed-off-by: Max Kellermann <max.kellermann@ionos.com>

diff --git a/src/common/Graylog.h b/src/common/Graylog.h
index f70ac754cfa71da2fa7e73ae63528742ba4697b9..953367ad7d1c9af0345eaa9b211022bc37c3ef1d 100644 (file)
--- a/src/common/Graylog.h
+++ b/src/common/Graylog.h
@@ -11,6 +11,8 @@
 
 #include "include/ceph_assert.h"  // boost clobbers this
 
+#include <sstream>
+
 struct uuid_d;
 class LogEntry;