Gateway Observability
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Envoy Gateway provides observability for the ControlPlane and the underlying EnvoyProxy instances. This task show you how to config gateway control-plane observability, includes metrics.
Prerequisites
Follow the steps from the Quickstart to install Envoy Gateway and the example manifest. Before proceeding, you should be able to query the example backend using HTTP.
Envoy Gateway provides an add-ons Helm Chart, which includes all the needing components for observability. By default, the OpenTelemetry Collector is disabled.
Install the add-ons Helm Chart:
helm install eg-addons oci://docker.io/envoyproxy/gateway-addons-helm --version v1.2.1 --set opentelemetry-collector.enabled=true -n monitoring --create-namespace
Metrics
The default installation of Envoy Gateway installs a default EnvoyGateway configuration and attaches it
using a ConfigMap
. In this section, we will update this resource to enable various ways to retrieve metrics
from Envoy Gateway.
Exported Metrics
Refer to the Gateway Exported Metrics List to learn more about Envoy Gateway’s Metrics.Retrieve Prometheus Metrics from Envoy Gateway
By default, prometheus metric is enabled. You can directly retrieve metrics from Envoy Gateway:
export ENVOY_POD_NAME=$(kubectl get pod -n envoy-gateway-system --selector=control-plane=envoy-gateway,app.kubernetes.io/instance=eg -o jsonpath='{.items[0].metadata.name}')
kubectl port-forward pod/$ENVOY_POD_NAME -n envoy-gateway-system 19001:19001
# check metrics
curl localhost:19001/metrics
The following is an example to disable prometheus metric for Envoy Gateway.
cat <<EOF | kubectl apply -f -
apiVersion: v1
kind: ConfigMap
metadata:
name: envoy-gateway-config
namespace: envoy-gateway-system
data:
envoy-gateway.yaml: |
apiVersion: gateway.envoyproxy.io/v1alpha1
kind: EnvoyGateway
provider:
type: Kubernetes
gateway:
controllerName: gateway.envoyproxy.io/gatewayclass-controller
telemetry:
metrics:
prometheus:
disable: true
EOF
Save and apply the following resource to your cluster:
---
apiVersion: v1
kind: ConfigMap
metadata:
name: envoy-gateway-config
namespace: envoy-gateway-system
data:
envoy-gateway.yaml: |
apiVersion: gateway.envoyproxy.io/v1alpha1
kind: EnvoyGateway
provider:
type: Kubernetes
gateway:
controllerName: gateway.envoyproxy.io/gatewayclass-controller
telemetry:
metrics:
prometheus:
disable: true
After updating the
ConfigMap
, you will need to wait the configuration kicks in.
You can force the configuration to be reloaded by restarting theenvoy-gateway
deployment.kubectl rollout restart deployment envoy-gateway -n envoy-gateway-system
Enable Open Telemetry sink in Envoy Gateway
The following is an example to send metric via Open Telemetry sink to OTEL gRPC Collector.
cat <<EOF | kubectl apply -f -
apiVersion: v1
kind: ConfigMap
metadata:
name: envoy-gateway-config
namespace: envoy-gateway-system
data:
envoy-gateway.yaml: |
apiVersion: gateway.envoyproxy.io/v1alpha1
kind: EnvoyGateway
provider:
type: Kubernetes
gateway:
controllerName: gateway.envoyproxy.io/gatewayclass-controller
telemetry:
metrics:
sinks:
- type: OpenTelemetry
openTelemetry:
host: otel-collector.monitoring.svc.cluster.local
port: 4317
protocol: grpc
EOF
Save and apply the following resource to your cluster:
---
apiVersion: v1
kind: ConfigMap
metadata:
name: envoy-gateway-config
namespace: envoy-gateway-system
data:
envoy-gateway.yaml: |
apiVersion: gateway.envoyproxy.io/v1alpha1
kind: EnvoyGateway
provider:
type: Kubernetes
gateway:
controllerName: gateway.envoyproxy.io/gatewayclass-controller
telemetry:
metrics:
sinks:
- type: OpenTelemetry
openTelemetry:
host: otel-collector.monitoring.svc.cluster.local
port: 4317
protocol: grpc
After updating the
ConfigMap
, you will need to wait the configuration kicks in.
You can force the configuration to be reloaded by restarting theenvoy-gateway
deployment.kubectl rollout restart deployment envoy-gateway -n envoy-gateway-system
Verify OTel-Collector metrics:
export OTEL_POD_NAME=$(kubectl get pod -n monitoring --selector=app.kubernetes.io/name=opentelemetry-collector -o jsonpath='{.items[0].metadata.name}')
kubectl port-forward pod/$OTEL_POD_NAME -n monitoring 19001:19001
# check metrics
curl localhost:19001/metrics
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