More info on metadata leak

src/core/lib/transport/metadata.cc

@@ -250,8 +250,18 @@ void grpc_mdctx_global_shutdown() {
     gpr_mu_destroy(&shard->mu);
     gc_mdtab(shard);
     if (shard->count != 0) {
-      gpr_log(GPR_DEBUG, "WARNING: %" PRIuPTR " metadata elements were leaked",
+      gpr_log(GPR_ERROR, "WARNING: %" PRIuPTR " metadata elements were leaked",
               shard->count);
+      for (int i = 0; i < shard->capacity; i++) {
+        for (InternedMetadata* md = shard->elems[i].next; md;
+             md = md->bucket_next()) {
+          char* key_str = grpc_slice_to_c_string(md->key());
+          char* value_str = grpc_slice_to_c_string(md->value());
+          gpr_log(GPR_ERROR, "mdelem '%s' = '%s'", key_str, value_str);
+          gpr_free(key_str);
+          gpr_free(value_str);
+        }
+      }
       if (grpc_iomgr_abort_on_leaks()) {
         abort();
       }