feat(exporters): working loki exporter

.github/workflows/ci.yaml

@@ -20,7 +20,7 @@ jobs:
       - name: Set up Go 
         uses: actions/setup-go@v4
         with:
-          go-version: '1.21'
+          go-version: '1.22'
 
       - name: Check diff
         run: make check-diff
@@ -39,7 +39,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v4
         with:
-          go-version: '1.21'
+          go-version: '1.22'
 
       - name: Lint
         run: make lint
@@ -57,7 +57,7 @@ jobs:
         - name: Set up Go
           uses: actions/setup-go@v4
           with:
-            go-version: '1.21'
+            go-version: '1.22'
 
         - name: Cache licenses
           uses: actions/cache@v3

.github/workflows/e2e.yaml

@@ -8,7 +8,7 @@ on:
   pull_request:
 
 env:
-  GO_VERSION: '1.21.5'
+  GO_VERSION: '1.22.1'
   KUBECTL_VERSION: 'v1.24.1'
 
 jobs:

Dockerfile

@@ -1,5 +1,5 @@
 # Build the manager binary
-FROM golang:1.21 as builder
+FROM golang:1.22 as builder
 ARG TARGETOS
 ARG TARGETARCH
 

api/telemetry/v1alpha1/collector_types.go

@@ -20,8 +20,11 @@ import (
 
 // CollectorSpec defines the desired state of Collector
 type CollectorSpec struct {
-	TenantSelector   metav1.LabelSelector `json:"tenantSelector,omitempty"`
-	ControlNamespace string               `json:"controlNamespace"`
+	TenantSelector metav1.LabelSelector `json:"tenantSelector,omitempty"`
+	// Namespace where OTel collector DaemonSet is deployed
+	ControlNamespace string `json:"controlNamespace"`
+	// Enables debug logging for the collector
+	Debug bool `json:"debug,omitempty"`
 }
 
 // CollectorStatus defines the observed state of Collector

api/telemetry/v1alpha1/oteloutput_types.go

@@ -27,15 +27,22 @@ type OtelOutputSpec struct {
 	// Important: Run "make" to regenerate code after modifying this file
 
 	// Foo is an example field of OtelOutput. Edit oteloutput_types.go to remove/update
-	OTLP OTLPgrpc `json:"otlp,omitempty"`
+	OTLP *OTLP `json:"otlp,omitempty"`
+	Loki *Loki `json:"loki,omitempty"`
 }
 
 // OTLP grpc exporter config ref: https://github.com/open-telemetry/opentelemetry-collector/blob/main/exporter/otlpexporter/config.go
-type OTLPgrpc struct {
-	QueueConfig     QueueSettings `json:"sending_queue,omitempty" yaml:"sending_queue,omitempty"`
-	RetryConfig     BackOffConfig `json:"retry_on_failure,omitempty" yaml:"retry_on_failure,omitempty"`
-	TimeoutSettings `json:",inline" yaml:",inline"`
-	ClientConfig    `json:",inline" yaml:",inline"`
+type OTLP struct {
+	QueueConfig      QueueSettings `json:"sending_queue,omitempty" yaml:"sending_queue,omitempty"`
+	RetryConfig      BackOffConfig `json:"retry_on_failure,omitempty" yaml:"retry_on_failure,omitempty"`
+	TimeoutSettings  `json:",inline" yaml:",inline"`
+	GRPCClientConfig `json:",inline" yaml:",inline"`
+}
+
+type Loki struct {
+	QueueConfig      QueueSettings `json:"sending_queue,omitempty" yaml:"sending_queue,omitempty"`
+	RetryConfig      BackOffConfig `json:"retry_on_failure,omitempty" yaml:"retry_on_failure,omitempty"`
+	HTTPClientConfig `json:",inline" yaml:",inline"`
 }
 
 // OtelOutputStatus defines the observed state of OtelOutput
@@ -44,8 +51,9 @@ type OtelOutputStatus struct {
 	// Important: Run "make" to regenerate code after modifying this file
 }
 
-//+kubebuilder:object:root=true
-//+kubebuilder:subresource:status
+// +kubebuilder:object:root=true
+// +kubebuilder:subresource:status
+// +kubebuilder:resource:categories=telemetry-all
 
 // OtelOutput is the Schema for the oteloutputs API
 type OtelOutput struct {
@@ -56,7 +64,7 @@ type OtelOutput struct {
 	Status OtelOutputStatus `json:"status,omitempty" `
 }
 
-//+kubebuilder:object:root=true
+// +kubebuilder:object:root=true
 
 // OtelOutputList contains a list of OtelOutput
 type OtelOutputList struct {
@@ -68,3 +76,7 @@ type OtelOutputList struct {
 func init() {
 	SchemeBuilder.Register(&OtelOutput{}, &OtelOutputList{})
 }
+
+func (o *OtelOutput) NamespacedName() NamespacedName {
+	return NamespacedName{Namespace: o.Namespace, Name: o.Name}
+}

api/telemetry/v1alpha1/otlp_config.go

@@ -18,6 +18,7 @@ import (
 	"time"
 
 	"go.opentelemetry.io/collector/config/configcompression"
+	"go.opentelemetry.io/collector/config/configopaque"
 )
 
 type TimeoutSettings struct {
@@ -69,14 +70,14 @@ type KeepaliveClientConfig struct {
 }
 
 // ClientConfig defines common settings for a gRPC client configuration.
-type ClientConfig struct {
+type GRPCClientConfig struct {
 	// The target to which the exporter is going to send traces or metrics,
 	// using the gRPC protocol. The valid syntax is described at
 	// https://github.com/grpc/grpc/blob/master/doc/naming.md.
 	Endpoint string `json:"endpoint" yaml:"endpoint"`
 
 	// The compression key for supported compression types within collector.
-	Compression configcompression.CompressionType `json:"compression,omitempty" yaml:"compression,omitempty"`
+	Compression configcompression.Type `json:"compression,omitempty" yaml:"compression,omitempty"`
 
 	// TLSSetting struct exposes TLS client configuration.
 	TLSSetting TLSClientSetting `json:"tls,omitempty" yaml:"tls,omitempty"`
@@ -172,3 +173,70 @@ type TLSSetting struct {
 	// If not set, it will never be reloaded (optional)
 	ReloadInterval time.Duration `json:"reload_interval,omitempty" yaml:"reload_interval,omitempty"`
 }
+
+// ClientConfig defines settings for creating an HTTP client.
+type HTTPClientConfig struct {
+	// The target URL to send data to (e.g.: http://some.url:9411/v1/traces).
+	Endpoint string `json:"endpoint,omitempty" yaml:"endpoint,omitempty"`
+
+	// ProxyURL setting for the collector
+	ProxyURL string `json:"proxy_url,omitempty" yaml:"proxy_url,omitempty"`
+
+	// TLSSetting struct exposes TLS client configuration.
+	TLSSetting TLSClientSetting `json:"tls,omitempty" yaml:"tls,omitempty"`
+
+	// ReadBufferSize for HTTP client. See http.Transport.ReadBufferSize.
+	ReadBufferSize int `json:"read_buffer_size,omitempty" yaml:"read_buffer_size,omitempty"`
+
+	// WriteBufferSize for HTTP client. See http.Transport.WriteBufferSize.
+	WriteBufferSize int `json:"write_buffer_size,omitempty" yaml:"write_buffer_size,omitempty"`
+
+	// Timeout parameter configures `http.Client.Timeout`.
+	Timeout time.Duration `json:"timeout,omitempty" yaml:"timeout,omitempty"`
+
+	// Additional headers attached to each HTTP request sent by the client.
+	// Existing header values are overwritten if collision happens.
+	// Header values are opaque since they may be sensitive.
+	Headers map[string]configopaque.String `json:"headers,omitempty" yaml:"headers,omitempty"`
+
+	// Auth configuration for outgoing HTTP calls.
+	Auth string `json:"auth,omitempty" yaml:"auth,omitempty"` //TODO this is a reference *configauth.Authentication
+
+	// The compression key for supported compression types within collector.
+	Compression configcompression.Type `json:"compression,omitempty" yaml:"compression,omitempty"`
+
+	// MaxIdleConns is used to set a limit to the maximum idle HTTP connections the client can keep open.
+	// There's an already set value, and we want to override it only if an explicit value provided
+	MaxIdleConns *int `json:"max_idle_conns,omitempty" yaml:"max_idle_conns,omitempty"`
+
+	// MaxIdleConnsPerHost is used to set a limit to the maximum idle HTTP connections the host can keep open.
+	// There's an already set value, and we want to override it only if an explicit value provided
+	MaxIdleConnsPerHost *int `json:"max_idle_conns_per_host,omitempty" yaml:"max_idle_conns_per_host,omitempty"`
+
+	// MaxConnsPerHost limits the total number of connections per host, including connections in the dialing,
+	// active, and idle states.
+	// There's an already set value, and we want to override it only if an explicit value provided
+	MaxConnsPerHost *int `json:"max_conns_per_host,omitempty" yaml:"max_conns_per_host,omitempty"`
+
+	// IdleConnTimeout is the maximum amount of time a connection will remain open before closing itself.
+	// There's an already set value, and we want to override it only if an explicit value provided
+	IdleConnTimeout *time.Duration `json:"idle_conn_timeout,omitempty" yaml:"idle_conn_timeout,omitempty"`
+
+	// DisableKeepAlives, if true, disables HTTP keep-alives and will only use the connection to the server
+	// for a single HTTP request.
+	//
+	// WARNING: enabling this option can result in significant overhead establishing a new HTTP(S)
+	// connection for every request. Before enabling this option please consider whether changes
+	// to idle connection settings can achieve your goal.
+	DisableKeepAlives bool `json:"disable_keep_alives,omitempty" yaml:"disable_keep_alives,omitempty"`
+
+	// This is needed in case you run into
+	// https://github.com/golang/go/issues/59690
+	// https://github.com/golang/go/issues/36026
+	// HTTP2ReadIdleTimeout if the connection has been idle for the configured value send a ping frame for health check
+	// 0s means no health check will be performed.
+	HTTP2ReadIdleTimeout time.Duration `json:"http2_read_idle_timeout,omitempty" yaml:"http2_read_idle_timeout,omitempty"`
+	// HTTP2PingTimeout if there's no response to the ping within the configured value, the connection will be closed.
+	// If not set or set to 0, it defaults to 15s.
+	HTTP2PingTimeout time.Duration `json:"http2_ping_timeout,omitempty" yaml:"http2_ping_timeout,omitempty"`
+}