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68 lines
2.5 KiB
Go
68 lines
2.5 KiB
Go
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/*
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Copyright 2019 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package metrics
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// Gauge is the methods of a gauge that are used by instrumented code.
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type Gauge interface {
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Set(float64)
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Inc()
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Dec()
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Add(float64)
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SetToCurrentTime()
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}
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// RatioedGauge tracks ratios.
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// The numerator is set/changed through the Gauge methods,
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// and the denominator can be updated through the SetDenominator method.
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// A ratio is tracked whenever the numerator or denominator is set/changed.
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type RatioedGauge interface {
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Gauge
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// SetDenominator sets the denominator to use until it is changed again
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SetDenominator(float64)
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}
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// RatioedGaugeVec creates related observers that are
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// differentiated by a series of label values
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type RatioedGaugeVec interface {
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// NewForLabelValuesSafe makes a new vector member for the given tuple of label values,
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// initialized with the given numerator and denominator.
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// Unlike the usual Vec WithLabelValues method, this is intended to be called only
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// once per vector member (at the start of its lifecycle).
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// The "Safe" part is saying that the returned object will function properly after metric registration
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// even if this method is called before registration.
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NewForLabelValuesSafe(initialNumerator, initialDenominator float64, labelValues []string) RatioedGauge
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}
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//////////////////////////////// Pairs ////////////////////////////////
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//
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// API Priority and Fairness tends to use RatioedGaugeVec members in pairs,
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// one for requests waiting in a queue and one for requests being executed.
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// The following definitions are a convenience layer that adds support for that
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// particular pattern of usage.
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// RatioedGaugePair is a corresponding pair of gauges, one for the
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// number of requests waiting in queue(s) and one for the number of
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// requests being executed.
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type RatioedGaugePair struct {
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// RequestsWaiting is given observations of the number of currently queued requests
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RequestsWaiting RatioedGauge
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// RequestsExecuting is given observations of the number of requests currently executing
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RequestsExecuting RatioedGauge
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}
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