Source File doc.go Belonging Package runtime/metrics
// 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 provides a stable interface to access implementation-defined
metrics exported by the Go runtime. This package is similar to existing functions
like runtime.ReadMemStats and debug.ReadGCStats, but significantly more general.
The set of metrics defined by this package may evolve as the runtime itself
evolves, and also enables variation across Go implementations, whose relevant
metric sets may not intersect.
Metrics are designated by a string key, rather than, for example, a field name in
a struct. The full list of supported metrics is always available in the slice of
Descriptions returned by All. Each Description also includes useful information
about the metric.
Thus, users of this API are encouraged to sample supported metrics defined by the
slice returned by All to remain compatible across Go versions. Of course, situations
arise where reading specific metrics is critical. For these cases, users are
encouraged to use build tags, and although metrics may be deprecated and removed,
users should consider this to be an exceptional and rare event, coinciding with a
very large change in a particular Go implementation.
Each metric key also has a "kind" that describes the format of the metric's value.
In the interest of not breaking users of this package, the "kind" for a given metric
is guaranteed not to change. If it must change, then a new metric will be introduced
with a new key and a new "kind."
Metric key format
As mentioned earlier, metric keys are strings. Their format is simple and well-defined,
designed to be both human and machine readable. It is split into two components,
separated by a colon: a rooted path and a unit. The choice to include the unit in
the key is motivated by compatibility: if a metric's unit changes, its semantics likely
did also, and a new key should be introduced.
For more details on the precise definition of the metric key's path and unit formats, see
the documentation of the Name field of the Description struct.
A note about floats
This package supports metrics whose values have a floating-point representation. In
order to improve ease-of-use, this package promises to never produce the following
classes of floating-point values: NaN, infinity.
Below is the full list of supported metrics, ordered lexicographically.
Count of completed GC cycles generated by the Go runtime.
Count of completed GC cycles forced by the application.
Count of all completed GC cycles.
Distribution of all objects allocated by approximate size.
Distribution of all objects freed by approximate size.
Heap size target for the end of the GC cycle.
Number of objects, live or unswept, occupying heap memory.
Distribution individual GC-related stop-the-world pause latencies.
Memory that is completely free and eligible to be returned to
the underlying system, but has not been. This metric is the
runtime's estimate of free address space that is backed by
Memory occupied by live objects and dead objects that have
not yet been marked free by the garbage collector.
Memory that is completely free and has been returned to
the underlying system. This metric is the runtime's estimate of
free address space that is still mapped into the process, but
is not backed by physical memory.
Memory allocated from the heap that is reserved for stack
space, whether or not it is currently in-use.
Memory that is reserved for heap objects but is not currently
used to hold heap objects.
Memory that is reserved for runtime mcache structures, but
Memory that is occupied by runtime mcache structures that
are currently being used.
Memory that is reserved for runtime mspan structures, but
Memory that is occupied by runtime mspan structures that are
currently being used.
Memory that is reserved for or used to hold runtime
Stack memory allocated by the underlying operating system.
Memory used by execution trace buffers, structures for
debugging the runtime, finalizer and profiler specials, and
Memory that is used by the stack trace hash map used for
All memory mapped by the Go runtime into the current process
as read-write. Note that this does not include memory mapped
by code called via cgo or via the syscall package.
Sum of all metrics in /memory/classes.
Count of live goroutines.
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