github.com/galamsiva2020/kubernetes-heapster-monitoring@v0.0.0-20210823134957-3c1baa7c1e70/events/api/handler.go (about) 1 // Copyright 2017 Google Inc. All Rights Reserved. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 package api 16 17 import ( 18 "errors" 19 "fmt" 20 "net/http" 21 "time" 22 23 "github.com/golang/glog" 24 "k8s.io/apiserver/pkg/server/healthz" 25 "k8s.io/heapster/events/manager" 26 ) 27 28 const ( 29 // MaxEventsScrapeDelay should be larger than `frequency` command line argument. 30 MaxEventsScrapeDelay = 3 * time.Minute 31 ) 32 33 func healthzChecker() healthz.HealthzChecker { 34 return healthz.NamedCheck("healthz", func(r *http.Request) error { 35 if time.Since(manager.LatestScrapeTime) > MaxEventsScrapeDelay { 36 msg := fmt.Sprintf( 37 "No event batch within %s (latest: %s)", 38 MaxEventsScrapeDelay, 39 manager.LatestScrapeTime, 40 ) 41 glog.Warning(msg) 42 return errors.New(msg) 43 } 44 45 return nil 46 }) 47 }