feat: add hostname, uptime and gateway count providers

[pmalek]

This PR adds more providers, specifically:

• hostname provider
• uptime provider (counting time since provider's creation time)
• gateways count provider

Open questions/issues

For some bizarre reason I can't get gateway counting to work in testing (mocked) environment.

When I don't register the custom GatewayList type as seen in tests in this PR, I get the following error:

panic: coding error: you must register resource to list kind for every resource you're going to LIST when creating the client.  See NewSimpleDynamicClientWithCustomListKinds or register the list into the scheme: gateway.networking.k8s.io/v1beta1, Resource=gateways out of map[/, Resource=:List /v1, Resource=apigroups:APIGroupList /v1, Resource=apiresources:APIResourceList /v1, Resource=componentstatuses:ComponentStatusList /v1, Resource=configmaps:ConfigMapList /v1, Resource=endpoints:EndpointsList /v1, Resource=events:EventList /v1, Resource=limitranges:LimitRangeList /v1, Resource=namespaces:NamespaceList /v1, Resource=nodes:NodeList /v1, Resource=persistentvolumeclaims:PersistentVolumeClaimList /v1, Resource=persistentvolumes:PersistentVolumeList /v1, Resource=pods:PodList /v1, Resource=podtemplates:PodTemplateList /v1, Resource=replicationcontrollers:ReplicationControllerList /v1, Resource=resourcequotas:ResourceQuotaList /v1, Resource=secrets:SecretList /v1, Resource=serviceaccounts:ServiceAccountList /v1
, Resource=services:ServiceList admissionregistration.k8s.io/v1, Resource=mutatingwebhookconfigurations:MutatingWebhookConfigurationList admissionregistration.k8s.io/v1, Resource=validatingwebhookconfigurations:ValidatingWebhookConfigurationList admissionregistration.k8s.io/v1beta1, Resource=mutatingwebhookconfigurations:MutatingWebhookConfigurationList admissionregistration.k8s.io/v1beta1, Resource=validatingwebhookconfigurations:ValidatingWebhookConfigurationList apps/v1, Resource=controllerrevisions:ControllerRevisionList apps/v1, Resource=daemonsets:DaemonSetList apps/v1, Resource=deployments:DeploymentList apps/v1, Resource=replicasets:ReplicaSetList apps/v1, Resource=statefulsets:StatefulSetList apps/v1beta1, Resource=controllerrevisions:ControllerRevisionList apps/v1beta1, Resource=deployments:DeploymentList apps/v1beta1, Resource=statefulsets:StatefulSetList apps/v1beta2, Resource=controllerrevisions:ControllerRevisionList apps/v1beta2, Resource=daemonsets:DaemonSetList apps/v1beta2, Resource=deployme
nts:DeploymentList apps/v1beta2, Resource=replicasets:ReplicaSetList apps/v1beta2, Resource=statefulsets:StatefulSetList autoscaling/v1, Resource=horizontalpodautoscalers:HorizontalPodAutoscalerList autoscaling/v2, Resource=horizontalpodautoscalers:HorizontalPodAutoscalerList autoscaling/v2beta1, Resource=horizontalpodautoscalers:HorizontalPodAutoscalerList autoscaling/v2beta2, Resource=horizontalpodautoscalers:HorizontalPodAutoscalerList batch/v1, Resource=cronjobs:CronJobList batch/v1, Resource=jobs:JobList batch/v1beta1, Resource=cronjobs:CronJobList certificates.k8s.io/v1, Resource=certificatesigningrequests:CertificateSigningRequestList certificates.k8s.io/v1beta1, Resource=certificatesigningrequests:CertificateSigningRequestList coordination.k8s.io/v1, Resource=leases:LeaseList coordination.k8s.io/v1beta1, Resource=leases:LeaseList discovery.k8s.io/v1, Resource=endpointslices:EndpointSliceList discovery.k8s.io/v1beta1, Resource=endpointslices:EndpointSliceList events.k8s.io/v1, Resource=events:EventList
 events.k8s.io/v1beta1, Resource=events:EventList extensions/v1beta1, Resource=daemonsets:DaemonSetList extensions/v1beta1, Resource=deployments:DeploymentList extensions/v1beta1, Resource=ingresses:IngressList extensions/v1beta1, Resource=networkpolicies:NetworkPolicyList extensions/v1beta1, Resource=podsecuritypolicies:PodSecurityPolicyList extensions/v1beta1, Resource=replicasets:ReplicaSetList flowcontrol.apiserver.k8s.io/v1alpha1, Resource=flowschemas:FlowSchemaList flowcontrol.apiserver.k8s.io/v1alpha1, Resource=prioritylevelconfigurations:PriorityLevelConfigurationList flowcontrol.apiserver.k8s.io/v1beta1, Resource=flowschemas:FlowSchemaList flowcontrol.apiserver.k8s.io/v1beta1, Resource=prioritylevelconfigurations:PriorityLevelConfigurationList flowcontrol.apiserver.k8s.io/v1beta2, Resource=flowschemas:FlowSchemaList flowcontrol.apiserver.k8s.io/v1beta2, Resource=prioritylevelconfigurations:PriorityLevelConfigurationList gateway.networking.k8s.io/v1beta1, Resource=gatewaies:GatewayList gateway.network
ing.k8s.io/v1beta1, Resource=gatewayclasses:GatewayClassList gateway.networking.k8s.io/v1beta1, Resource=httproutes:HTTPRouteList internal.apiserver.k8s.io/v1alpha1, Resource=storageversions:StorageVersionList networking.k8s.io/v1, Resource=ingressclasses:IngressClassList networking.k8s.io/v1, Resource=ingresses:IngressList networking.k8s.io/v1, Resource=networkpolicies:NetworkPolicyList networking.k8s.io/v1beta1, Resource=ingressclasses:IngressClassList networking.k8s.io/v1beta1, Resource=ingresses:IngressList node.k8s.io/v1, Resource=runtimeclasses:RuntimeClassList node.k8s.io/v1alpha1, Resource=runtimeclasses:RuntimeClassList node.k8s.io/v1beta1, Resource=runtimeclasses:RuntimeClassList policy/v1, Resource=poddisruptionbudgets:PodDisruptionBudgetList policy/v1beta1, Resource=poddisruptionbudgets:PodDisruptionBudgetList policy/v1beta1, Resource=podsecuritypolicies:PodSecurityPolicyList rbac.authorization.k8s.io/v1, Resource=clusterrolebindings:ClusterRoleBindingList rbac.authorization.k8s.io/v1, Resource=cl
usterroles:ClusterRoleList rbac.authorization.k8s.io/v1, Resource=rolebindings:RoleBindingList rbac.authorization.k8s.io/v1, Resource=roles:RoleList rbac.authorization.k8s.io/v1alpha1, Resource=clusterrolebindings:ClusterRoleBindingList rbac.authorization.k8s.io/v1alpha1, Resource=clusterroles:ClusterRoleList rbac.authorization.k8s.io/v1alpha1, Resource=rolebindings:RoleBindingList rbac.authorization.k8s.io/v1alpha1, Resource=roles:RoleList rbac.authorization.k8s.io/v1beta1, Resource=clusterrolebindings:ClusterRoleBindingList rbac.authorization.k8s.io/v1beta1, Resource=clusterroles:ClusterRoleList rbac.authorization.k8s.io/v1beta1, Resource=rolebindings:RoleBindingList rbac.authorization.k8s.io/v1beta1, Resource=roles:RoleList scheduling.k8s.io/v1, Resource=priorityclasses:PriorityClassList scheduling.k8s.io/v1alpha1, Resource=priorityclasses:PriorityClassList scheduling.k8s.io/v1beta1, Resource=priorityclasses:PriorityClassList storage.k8s.io/v1, Resource=csidrivers:CSIDriverList storage.k8s.io/v1, Resource=
csinodes:CSINodeList storage.k8s.io/v1, Resource=csistoragecapacities:CSIStorageCapacityList storage.k8s.io/v1, Resource=storageclasses:StorageClassList storage.k8s.io/v1, Resource=volumeattachments:VolumeAttachmentList storage.k8s.io/v1alpha1, Resource=csistoragecapacities:CSIStorageCapacityList storage.k8s.io/v1alpha1, Resource=volumeattachments:VolumeAttachmentList storage.k8s.io/v1beta1, Resource=csidrivers:CSIDriverList storage.k8s.io/v1beta1, Resource=csinodes:CSINodeList storage.k8s.io/v1beta1, Resource=csistoragecapacities:CSIStorageCapacityList storage.k8s.io/v1beta1, Resource=storageclasses:StorageClassList storage.k8s.io/v1beta1, Resource=volumeattachments:VolumeAttachmentList]

goroutine 38 [running]:
k8s.io/client-go/dynamic/fake.(*dynamicResourceClient).List(0x140004fec60, {0x10367b698?, 0x140005440c0?}, {{{0x0, 0x0}, {0x0, 0x0}}, {0x0, 0x0}, {0x0, ...}, ...})
        /Users/[email protected]/.gvm/pkgsets/go1.19/global/pkg/mod/k8s.io/[email protected]/dynamic/fake/simple.go:353 +0x808
github.com/kong/kubernetes-telemetry/pkg/provider.(*k8sObjectCount).Provide(0x140004fecc0, {0x10367b698, 0x140005440c0})
        /Users/[email protected]/code_/kubernetes-telemetry/pkg/provider/k8sobjectcountprovider.go:33 +0x94
github.com/kong/kubernetes-telemetry/pkg/telemetry.(*workflow).Execute.func1()
        /Users/[email protected]/code_/kubernetes-telemetry/pkg/telemetry/workflow.go:72 +0x7c
github.com/gammazero/workerpool.startWorker(0x0?, 0x1400052c2a0)
        /Users/[email protected]/.gvm/pkgsets/go1.19/global/pkg/mod/github.com/gammazero/[email protected]/workerpool.go:233 +0x28
created by github.com/gammazero/workerpool.(*WorkerPool).dispatch
        /Users/[email protected]/.gvm/pkgsets/go1.19/global/pkg/mod/github.com/gammazero/[email protected]/workerpool.go:195 +0x1e8

where a sharp eye can spot Resource=gatewaies:GatewayList gateway.network ing.k8s.io/v1beta1 which to me should be gateways (?).

Quick google search shows an issue in kubernetes/client-go#1082 (comment).

EDIT: It seems there's a fix for the above: kubernetes/kubernetes#110053.
If I understand it correctly this will require https://github.com/kubernetes/kubernetes/tree/master/staging 's apimachinery dir to be synced out to https://github.com/kubernetes/apimachinery and then a release of that.

[shaneutt]

Make sure TODOs are resolved by either making the relevant changes, OR creating and linking a follow-up issue so they don't end up untracked and then LGTM.

[pmalek]

@shaneutt Added:

• k8sObjectCount: consider detecting what resource versions are available before adding a provider for it. #41
• manager: don't abort collecting providers' reports when encountering errors #42
• Counting gateways doesn't work in tests due to upstream bug #43

Thanks!