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40 lines
1.4 KiB
Go
40 lines
1.4 KiB
Go
// Licensed to the LF AI & Data foundation under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package cache
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import (
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"github.com/prometheus/client_golang/prometheus"
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)
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// WIP: this function is a showcase of how to use prometheus, do not use it in production.
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func PrometheusCacheMonitor[K comparable, V any](c Cache[K, V], namespace, subsystem string) {
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hitRate := prometheus.NewGaugeFunc(
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prometheus.GaugeOpts{
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Namespace: namespace,
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Subsystem: subsystem,
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Name: "cache_hitrate",
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Help: "hit rate equals hitcount / (hitcount + misscount)",
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},
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func() float64 {
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hit := float64(c.Stats().HitCount.Load())
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miss := float64(c.Stats().MissCount.Load())
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return hit / (hit + miss)
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})
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// TODO: adding more metrics.
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prometheus.MustRegister(hitRate)
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}
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