mgr/MDSPerfMetricTypes.h: use <iosfwd>

Reduce header bloat a bit.

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

diff --git a/src/mgr/MDSPerfMetricTypes.h b/src/mgr/MDSPerfMetricTypes.h
index 2323afcdd1bbd901ec382d03bccd87c1acfbea90..99f9cdcaed5c9ec7a70de4bfbfaad0ef5ab61908 100644 (file)
--- a/src/mgr/MDSPerfMetricTypes.h
+++ b/src/mgr/MDSPerfMetricTypes.h
@@ -6,7 +6,7 @@
 
 #include <regex>
 #include <vector>
-#include <iostream>
+#include <iosfwd>
 
 #include "include/denc.h"
 #include "include/stringify.h"