package metrics_test

import (
	"fmt"
	"runtime/metrics"
)

func ExampleRead_readingOneMetric() {
	// Name of the metric we want to read.
	const myMetric = "/memory/classes/heap/free:bytes"

	// Create a sample for the metric.
	sample := make([]metrics.Sample, 1)
	sample[0].Name = myMetric

	// Sample the metric.
	metrics.Read(sample)

	// Check if the metric is actually supported.

func (m *MetricValues) setDriveAPIMetrics(disk madmin.Disk, labels []string) {
	if disk.Metrics == nil {
		return
	}

	m.Set(driveTimeoutErrorsTotal, float64(disk.Metrics.TotalErrorsTimeout), labels...)
	m.Set(driveIOErrorsTotal, float64(disk.Metrics.TotalErrorsAvailability-disk.Metrics.TotalErrorsTimeout), labels...)
	m.Set(driveAvailabilityErrorsTotal, float64(disk.Metrics.TotalErrorsAvailability), labels...)

}

// MetricAsyncRecorder records metric in a separate goroutine to avoid overhead in the critical path.
type MetricAsyncRecorder struct {
	// bufferCh is a channel that serves as a metrics buffer before the metricsRecorder goroutine reports it.
	bufferCh chan *metric
	// if bufferSize is reached, incoming metrics will be discarded.
	bufferSize int
	// how often the recorder runs to flush the metrics.
	interval time.Duration

	if s.Memory == nil || s.Memory.WorkingSetBytes == nil {
		return
	}

	ch <- metrics.NewLazyMetricWithTimestamp(s.Memory.Time.Time,
		metrics.NewLazyConstMetric(nodeMemoryUsageDesc, metrics.GaugeValue, float64(*s.Memory.WorkingSetBytes)))
}

func (rc *resourceMetricsCollector) collectNodeSwapMetrics(ch chan<- metrics.Metric, s summary.NodeStats) {

	// more information about how each type of metric must respond.
	// +optional
	// +listType=atomic
	Metrics []MetricSpec `json:"metrics,omitempty" protobuf:"bytes,4,rep,name=metrics"`
}

// MetricSourceType indicates the type of metric.
type MetricSourceType string

const (
	// ObjectMetricSourceType is a metric describing a kubernetes object
	// (for example, hits-per-second on an Ingress object).

  optional k8s.io.apimachinery.pkg.api.resource.Quantity targetValue = 3;

  // selector is the string-encoded form of a standard kubernetes label selector for the given metric
  // When set, it is passed as an additional parameter to the metrics server for more specific metrics scoping
  // When unset, just the metricName will be used to gather metrics.
  // +optional

		"Count of online drives in the cluster")
	healthDrivesCountMD = NewGaugeMD(healthDrivesCount,
		"Count of all drives in the cluster")
)

// loadClusterHealthDriveMetrics - `MetricsLoaderFn` for cluster storage drive metrics
// such as online, offline and total drives.
func loadClusterHealthDriveMetrics(ctx context.Context, m MetricValues,
	c *metricsCache,
) error {
	clusterDriveMetrics, _ := c.clusterDriveMetrics.Get()

  // target specifies the target value for the given metric
  optional MetricTarget target = 2;

  // metric identifies the target metric by name and selector
  optional MetricIdentifier metric = 3;
}

// ObjectMetricStatus indicates the current value of a metric describing a
// kubernetes object (for example, hits-per-second on an Ingress object).
message ObjectMetricStatus {
  // metric identifies the target metric by name and selector

  // target specifies the target value for the given metric
  optional MetricTarget target = 2;

  // metric identifies the target metric by name and selector
  optional MetricIdentifier metric = 3;
}

// ObjectMetricStatus indicates the current value of a metric describing a
// kubernetes object (for example, hits-per-second on an Ingress object).
message ObjectMetricStatus {
  // metric identifies the target metric by name and selector

	"name":     "name is the name of the given metric",
	"selector": "selector is the string-encoded form of a standard kubernetes label selector for the given metric When set, it is passed as an additional parameter to the metrics server for more specific metrics scoping. When unset, just the metricName will be used to gather metrics.",
}