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diff --git a/src/cpp/server/load_reporter/constants.h b/src/cpp/server/load_reporter/constants.h
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+++ b/src/cpp/server/load_reporter/constants.h
@@ -0,0 +1,71 @@
+/*
+ *
+ * Copyright 2018 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+#ifndef GRPC_SRC_CPP_SERVER_LOAD_REPORTER_UTIL_H
+#define GRPC_SRC_CPP_SERVER_LOAD_REPORTER_UTIL_H
+
+#include <grpc/impl/codegen/port_platform.h>
+
+namespace grpc {
+namespace load_reporter {
+
+constexpr size_t kLbIdLength = 8;
+constexpr size_t kIpv4AddressLength = 8;
+constexpr size_t kIpv6AddressLength = 32;
+
+constexpr char kInvalidLbId[] = "<INVALID_LBID_238dsb234890rb>";
+
+// Call statuses.
+
+constexpr char kCallStatusOk[] = "OK";
+constexpr char kCallStatusServerError[] = "5XX";
+constexpr char kCallStatusClientError[] = "4XX";
+
+// Tag keys.
+
+constexpr char kTagKeyToken[] = "token";
+constexpr char kTagKeyHost[] = "host";
+constexpr char kTagKeyUserId[] = "user_id";
+constexpr char kTagKeyStatus[] = "status";
+constexpr char kTagKeyMetricName[] = "metric_name";
+
+// Measure names.
+
+constexpr char kMeasureStartCount[] = "grpc.io/lb/start_count";
+constexpr char kMeasureEndCount[] = "grpc.io/lb/end_count";
+constexpr char kMeasureEndBytesSent[] = "grpc.io/lb/bytes_sent";
+constexpr char kMeasureEndBytesReceived[] = "grpc.io/lb/bytes_received";
+constexpr char kMeasureEndLatencyMs[] = "grpc.io/lb/latency_ms";
+constexpr char kMeasureOtherCallMetric[] = "grpc.io/lb/other_call_metric";
+
+// View names.
+
+constexpr char kViewStartCount[] = "grpc.io/lb_view/start_count";
+constexpr char kViewEndCount[] = "grpc.io/lb_view/end_count";
+constexpr char kViewEndBytesSent[] = "grpc.io/lb_view/bytes_sent";
+constexpr char kViewEndBytesReceived[] = "grpc.io/lb_view/bytes_received";
+constexpr char kViewEndLatencyMs[] = "grpc.io/lb_view/latency_ms";
+constexpr char kViewOtherCallMetricCount[] =
+    "grpc.io/lb_view/other_call_metric_count";
+constexpr char kViewOtherCallMetricValue[] =
+    "grpc.io/lb_view/other_call_metric_value";
+
+}  // namespace load_reporter
+}  // namespace grpc
+
+#endif  // GRPC_SRC_CPP_SERVER_LOAD_REPORTER_UTIL_H