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// Copyright 2020 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package metrics
import (
_ "runtime" // depends on the runtime via a linkname'd function
"unsafe"
)
// Sample captures a single metric sample.
type Sample struct {
// Name is the name of the metric sampled.
//
// It must correspond to a name in one of the metric descriptions
// returned by Descriptions.
Name string
// Value is the value of the metric sample.
Value Value
}
// Implemented in the runtime.
func runtime_readMetrics(unsafe.Pointer, int, int)
// Read populates each Value field in the given slice of metric samples.
//
// Desired metrics should be present in the slice with the appropriate name.
// The user of this API is encouraged to re-use the same slice between calls.
//
// Metric values with names not appearing in the value returned by Descriptions
// will have the value populated as KindBad to indicate that the name is
// unknown.
func Read(m []Sample) {
runtime_readMetrics(unsafe.Pointer(&m[0]), len(m), cap(m))
}
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