metrics

var (
	// APICallDuration metric measures the latency of API server calls.
	APICallDuration metric.Float64Histogram

	// ReconcilerErrors metric measures the number of errors in the reconciler.
	ReconcilerErrors metric.Int64Gauge

	// PipelineError metric measures the error by components when syncing a commit.
	// Definition here must exactly match the definition in the resource-group
	// controller, or the Prometheus exporter will error. b/247516388
	// https://github.com/GoogleContainerTools/kpt-resource-group/blob/main/controllers/metrics/metrics.go#L88
	PipelineError metric.Int64Gauge

	// ReconcileDuration metric measures the latency of reconcile events.
	ReconcileDuration metric.Float64Histogram

	// ParserDuration metric measures the latency of the parse-apply-watch loop.
	ParserDuration metric.Float64Histogram

	// LastSync metric measures the timestamp of the latest Git sync.
	LastSync metric.Int64Gauge

	// DeclaredResources metric measures the number of declared resources parsed from Git.
	DeclaredResources metric.Int64Gauge

	// ApplyOperations metric measures the number of applier apply events.
	ApplyOperations metric.Int64Counter

	// ApplyDuration metric measures the latency of applier apply events.
	ApplyDuration metric.Float64Histogram

	// ResourceFights metric measures the number of resource fights.
	ResourceFights metric.Int64Counter

	// RemediateDuration metric measures the latency of remediator reconciliation events.
	RemediateDuration metric.Float64Histogram

	// LastApply metric measures the timestamp of the most recent applier apply event.
	LastApply metric.Int64Gauge

	// ResourceConflicts metric measures the number of resource conflicts.
	ResourceConflicts metric.Int64Counter

	// InternalErrors metric measures the number of unexpected internal errors triggered by defensive checks in Config Sync.
	InternalErrors metric.Int64Counter
)

var (
	// KeyName groups metrics by the reconciler name. Possible values: root-reconciler, ns-reconciler-<namespace>
	// TODO b/208316928 remove this key from pipeline_error_observed metric once same metric in Resource Group Controller has this tag removed
	KeyName = attribute.Key("name")

	// KeyReconcilerType groups metrics by the reconciler type. Possible values: root, namespace.
	// TODO: replace with configsync.sync.kind resource attribute
	KeyReconcilerType = attribute.Key("reconciler")

	// KeyOperation groups metrics by their operation. Possible values: create, patch, update, delete.
	KeyOperation = attribute.Key("operation")

	// KeyController groups metrics by their controller. Possible values: applier, remediator.
	KeyController = attribute.Key("controller")

	// KeyComponent groups metrics by their component. Possible values: source, sync, rendering, readiness(from Resource Group Controller).
	KeyComponent = attribute.Key("component")

	// KeyExportedComponent groups metrics by their component.
	// The "component" metric tag overlaps with a resource tag exported by
	// resource_to_telemetry_conversion when using Prometheus. So it's renamed
	// "exported_component" when exported to Prometheus.
	// TODO: Fix this naming overlap by renaming the "component" metric tag.
	// Possible values: source, sync, rendering, readiness (from Resource Group Controller).
	KeyExportedComponent = attribute.Key("exported_component")

	// KeyErrorClass groups metrics by their error code.
	KeyErrorClass = attribute.Key("errorclass")

	// KeyStatus groups metrics by their status. Possible values: success, error.
	KeyStatus = attribute.Key("status")

	// KeyInternalErrorSource groups the InternalError metrics by their source. Possible values: parser, differ, remediator.
	KeyInternalErrorSource = attribute.Key("source")

	// KeyParserSource groups the metrics for the parser by their source. Possible values: read, parse, update.
	KeyParserSource = attribute.Key("source")

	// KeyTrigger groups metrics by their trigger. Possible values: retry, watchUpdate, managementConflict, resync, reimport.
	KeyTrigger = attribute.Key("trigger")

	// KeyCommit groups metrics by their git commit. Even though this tag has a high cardinality,
	// it is only used by the `last_sync_timestamp` and `last_apply_timestamp` metrics.
	// These are both aggregated as LastValue metrics so the number of recorded values will always be
	// at most 1 per git commit.
	KeyCommit = attribute.Key("commit")

	// KeyContainer groups metrics by their container names. Possible values: reconciler, git-sync.
	// TODO: replace with k8s.container.name resource attribute
	KeyContainer = attribute.Key("container")

	// KeyResourceType groups metrics by their resource types. Possible values: cpu, memory.
	KeyResourceType = attribute.Key("resource")
)

var (
	// ResourceKeySyncKind groups metrics by the Sync kind. Possible values: RootSync, RepoSync.
	ResourceKeySyncKind = attribute.Key("configsync_sync_kind")

	// ResourceKeySyncName groups metrics by the Sync name.
	ResourceKeySyncName = attribute.Key("configsync_sync_name")

	// ResourceKeySyncNamespace groups metrics by the Sync namespace.
	ResourceKeySyncNamespace = attribute.Key("configsync_sync_namespace")

	// ResourceKeySyncGeneration groups metrics by the Sync metadata.generation.
	ResourceKeySyncGeneration = attribute.Key("configsync_sync_generation")

	// ResourceKeyDeploymentName groups metrics by k8s deployment name.
	ResourceKeyDeploymentName = attribute.Key("k8s_deployment_name")

	// ResourceKeyPodName groups metrics by k8s pod name.
	ResourceKeyPodName = attribute.Key("k8s_pod_name")
)