mirror of
https://github.com/octoleo/restic.git
synced 2024-11-30 00:33:57 +00:00
70 lines
2.8 KiB
Go
70 lines
2.8 KiB
Go
|
// Copyright 2017, OpenCensus Authors
|
||
|
|
//
|
||
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
||
|
|
// you may not use this file except in compliance with the License.
|
||
|
|
// You may obtain a copy of the License at
|
||
|
|
//
|
||
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
||
|
|
//
|
||
|
|
// Unless required by applicable law or agreed to in writing, software
|
||
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
||
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||
|
|
// See the License for the specific language governing permissions and
|
||
|
|
// limitations under the License.
|
||
|
|
//
|
||
|
|
|
||
|
|
/*
|
||
|
|
Package stats contains support for OpenCensus stats recording.
|
||
|
|
|
||
|
|
OpenCensus allows users to create typed measures, record measurements,
|
||
|
|
aggregate the collected data, and export the aggregated data.
|
||
|
|
|
||
|
|
Measures
|
||
|
|
|
||
|
|
A measure represents a type of data point to be tracked and recorded.
|
||
|
|
For example, latency, request Mb/s, and response Mb/s are measures
|
||
|
|
to collect from a server.
|
||
|
|
|
||
|
|
Measure constructors such as Int64 and Float64 automatically
|
||
|
|
register the measure by the given name. Each registered measure needs
|
||
|
|
to be unique by name. Measures also have a description and a unit.
|
||
|
|
|
||
|
|
Libraries can define and export measures. Application authors can then
|
||
|
|
create views and collect and break down measures by the tags they are
|
||
|
|
interested in.
|
||
|
|
|
||
|
|
Recording measurements
|
||
|
|
|
||
|
|
Measurement is a data point to be collected for a measure. For example,
|
||
|
|
for a latency (ms) measure, 100 is a measurement that represents a 100ms
|
||
|
|
latency event. Measurements are created from measures with
|
||
|
|
the current context. Tags from the current context are recorded with the
|
||
|
|
measurements if they are any.
|
||
|
|
|
||
|
|
Recorded measurements are dropped immediately if no views are registered for them.
|
||
|
|
There is usually no need to conditionally enable and disable
|
||
|
|
recording to reduce cost. Recording of measurements is cheap.
|
||
|
|
|
||
|
|
Libraries can always record measurements, and applications can later decide
|
||
|
|
on which measurements they want to collect by registering views. This allows
|
||
|
|
libraries to turn on the instrumentation by default.
|
||
|
|
|
||
|
|
Exemplars
|
||
|
|
|
||
|
|
For a given recorded measurement, the associated exemplar is a diagnostic map
|
||
|
|
that gives more information about the measurement.
|
||
|
|
|
||
|
|
When aggregated using a Distribution aggregation, an exemplar is kept for each
|
||
|
|
bucket in the Distribution. This allows you to easily find an example of a
|
||
|
|
measurement that fell into each bucket.
|
||
|
|
|
||
|
|
For example, if you also use the OpenCensus trace package and you
|
||
|
|
record a measurement with a context that contains a sampled trace span,
|
||
|
|
then the trace span will be added to the exemplar associated with the measurement.
|
||
|
|
|
||
|
|
When exported to a supporting back end, you should be able to easily navigate
|
||
|
|
to example traces that fell into each bucket in the Distribution.
|
||
|
|
|
||
|
|
*/
|
||
|
|
package stats // import "go.opencensus.io/stats"
|