@Override
    public MeterIdPrefix completeRequestPrefix(MeterRegistry registry, RequestLog log) {
        /* grpc.status, hostname.pattern, http.status, method, service */
        final Builder<Tag> tagListBuilder = ImmutableList.builderWithExpectedSize(4);
        addGrpcStatus(tagListBuilder, log);
        addCompleteRequestPrefixTags(tagListBuilder, log);
        return new MeterIdPrefix(name, tagListBuilder.build());
    }
Returns a newly created {@link GrpcMeterIdPrefixFunction} with the specified {@code name}.
grpc/src/main/java/com/linecorp/armeria/common/grpc/GrpcMeterIdPrefixFunction.java