"model",
        "model_path",
        "stage",
    },
    // Scale of 10, power of 1.8 with bucket count 37 (~258 minutes).
    monitoring::Buckets::Exponential(10, 1.8, 37));

constexpr char kLoadAttemptFail[] = "fail";
constexpr char kLoadAttemptSuccess[] = "success";
// `tensorflow::LoadSavedModel` API label.
constexpr char kCCLoadLabel[] = "cc_load";

uint64 GetLatencyMicroseconds(const uint64 start_microseconds) {