const (
    // NetworkPluginOperationsKey is the key for operation count metrics.
    NetworkPluginOperationsKey = "network_plugin_operations"
    // NetworkPluginOperationsLatencyKey is the key for the operation latency metrics.
    NetworkPluginOperationsLatencyKey = "network_plugin_operations_duration_seconds"
    // DeprecatedNetworkPluginOperationsLatencyKey is the deprecated key for the operation latency metrics.
    DeprecatedNetworkPluginOperationsLatencyKey = "network_plugin_operations_latency_microseconds"
)

var (
    // NetworkPluginOperationsLatency collects operation latency numbers by operation
    // type.
    NetworkPluginOperationsLatency = prometheus.NewHistogramVec(
        prometheus.HistogramOpts{
            Subsystem: kubeletSubsystem,
            Name:      NetworkPluginOperationsLatencyKey,
            Help:      "Latency in seconds of network plugin operations. Broken down by operation type.",
            Buckets:   prometheus.DefBuckets,
        },
        []string{"operation_type"},
    )

    // DeprecatedNetworkPluginOperationsLatency collects operation latency numbers by operation
    // type.
    DeprecatedNetworkPluginOperationsLatency = prometheus.NewSummaryVec(
        prometheus.SummaryOpts{
            Subsystem: kubeletSubsystem,
            Name:      DeprecatedNetworkPluginOperationsLatencyKey,
            Help:      "(Deprecated) Latency in microseconds of network plugin operations. Broken down by operation type.",
        },
        []string{"operation_type"},
    )
)