[exporter/loadbalancingexporter] support k8s service resolver

Signed-off-by: Yuan Fang <yuanfang@alauda.io>

exporter/loadbalancingexporter/README.md

@@ -66,6 +66,12 @@ exporters:
         - backend-2:4317
         - backend-3:4317
         - backend-4:4317
+      ## use k8s service resolver, if collector runs in kubernetes environment
+      #k8s:
+      #  service: lb-svc.kube-public
+      #  ports:
+      #    - 15317
+      #    - 16317
 
 service:
   pipelines:

exporter/loadbalancingexporter/config.go

@@ -32,6 +32,7 @@ type Protocol struct {
 type ResolverSettings struct {
 	Static *StaticResolver `mapstructure:"static"`
 	DNS    *DNSResolver    `mapstructure:"dns"`
+	K8sSvc *K8sSvcResolver `mapstructure:"k8s"`
 }
 
 // StaticResolver defines the configuration for the resolver providing a fixed list of backends
@@ -46,3 +47,9 @@ type DNSResolver struct {
 	Interval time.Duration `mapstructure:"interval"`
 	Timeout  time.Duration `mapstructure:"timeout"`
 }
+
+// K8sSvcResolver defines the configuration for the DNS resolver
+type K8sSvcResolver struct {
+	Service string  `mapstructure:"service"`
+	Ports   []int32 `mapstructure:"ports"`
+}

exporter/loadbalancingexporter/go.mod

@@ -16,6 +16,10 @@ require (
 	go.opentelemetry.io/collector/semconv v0.78.2
 	go.uber.org/multierr v1.11.0
 	go.uber.org/zap v1.24.0
+	k8s.io/api v0.27.2
+	k8s.io/apimachinery v0.27.2
+	k8s.io/client-go v0.27.2
+	sigs.k8s.io/controller-runtime v0.15.0
 )
 
 require (
@@ -24,29 +28,43 @@ require (
 	github.com/cenkalti/backoff/v4 v4.2.1 // indirect
 	github.com/cespare/xxhash/v2 v2.2.0 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/emicklei/go-restful/v3 v3.9.0 // indirect
+	github.com/evanphx/json-patch v4.12.0+incompatible // indirect
+	github.com/evanphx/json-patch/v5 v5.6.0 // indirect
 	github.com/fsnotify/fsnotify v1.6.0 // indirect
 	github.com/go-kit/log v0.2.1 // indirect
 	github.com/go-logfmt/logfmt v0.5.1 // indirect
 	github.com/go-logr/logr v1.2.4 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
 	github.com/go-ole/go-ole v1.2.6 // indirect
+	github.com/go-openapi/jsonpointer v0.19.6 // indirect
+	github.com/go-openapi/jsonreference v0.20.1 // indirect
+	github.com/go-openapi/swag v0.22.3 // indirect
 	github.com/gogo/protobuf v1.3.2 // indirect
 	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
 	github.com/golang/protobuf v1.5.3 // indirect
 	github.com/golang/snappy v0.0.4 // indirect
+	github.com/google/gnostic v0.5.7-v3refs // indirect
+	github.com/google/go-cmp v0.5.9 // indirect
+	github.com/google/gofuzz v1.1.0 // indirect
 	github.com/google/uuid v1.3.0 // indirect
+	github.com/imdario/mergo v0.3.6 // indirect
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/josharian/intern v1.0.0 // indirect
 	github.com/json-iterator/go v1.1.12 // indirect
 	github.com/klauspost/compress v1.16.5 // indirect
 	github.com/knadh/koanf v1.5.0 // indirect
 	github.com/lufia/plan9stats v0.0.0-20211012122336-39d0f177ccd0 // indirect
+	github.com/mailru/easyjson v0.7.7 // indirect
 	github.com/matttproud/golang_protobuf_extensions v1.0.4 // indirect
 	github.com/mitchellh/copystructure v1.2.0 // indirect
 	github.com/mitchellh/mapstructure v1.5.0 // indirect
 	github.com/mitchellh/reflectwalk v1.0.2 // indirect
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.2 // indirect
 	github.com/mostynb/go-grpc-compression v1.1.18 // indirect
+	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/power-devops/perfstat v0.0.0-20210106213030-5aafc221ea8c // indirect
 	github.com/prometheus/client_golang v1.15.1 // indirect
@@ -74,14 +92,25 @@ require (
 	go.opentelemetry.io/otel/trace v1.15.1 // indirect
 	go.uber.org/atomic v1.10.0 // indirect
 	golang.org/x/net v0.10.0 // indirect
+	golang.org/x/oauth2 v0.7.0 // indirect
 	golang.org/x/sys v0.8.0 // indirect
+	golang.org/x/term v0.8.0 // indirect
 	golang.org/x/text v0.9.0 // indirect
+	golang.org/x/time v0.3.0 // indirect
 	gonum.org/v1/gonum v0.13.0 // indirect
+	google.golang.org/appengine v1.6.7 // indirect
 	google.golang.org/genproto v0.0.0-20230410155749-daa745c078e1 // indirect
 	google.golang.org/grpc v1.55.0 // indirect
 	google.golang.org/protobuf v1.30.0 // indirect
+	gopkg.in/inf.v0 v0.9.1 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
+	k8s.io/klog/v2 v2.90.1 // indirect
+	k8s.io/kube-openapi v0.0.0-20230501164219-8b0f38b5fd1f // indirect
+	k8s.io/utils v0.0.0-20230209194617-a36077c30491 // indirect
+	sigs.k8s.io/json v0.0.0-20221116044647-bc3834ca7abd // indirect
+	sigs.k8s.io/structured-merge-diff/v4 v4.2.3 // indirect
+	sigs.k8s.io/yaml v1.3.0 // indirect
 )
 
 replace github.com/open-telemetry/opentelemetry-collector-contrib/pkg/batchpersignal => ../../pkg/batchpersignal