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Observability
This page will describe how to configure different observability tools to work with Kong Mesh.
Demo setup
kumactl
ships with a builtin observability stack which consists of:
- prometheus for metrics
- jaeger for ingesting and storing traces
- loki for ingesting and storing logs
- grafana for querying and displaying metrics, traces and logs
First, remember to configure Kong Mesh appropriately for the tools in the observability stack:
- Traffic metrics for telemetry
-
TrafficTrace
for tracing -
TrafficLog
for logging
On Kubernetes, the stack can be installed with:
kumactl install observability | kubectl apply -f -
This will create a namespace mesh-observability
with prometheus, jaeger, loki and grafana installed and setup to work with Kong Mesh.
This setup is meant to be used for trying out Kong Mesh. It is in no way fit for use in production. For production setups we recommend referring to each project’s website or to use a hosted solution like Grafana cloud or Datadog.
Control plane observability
The control plane supports metrics and traces for observability.
Metrics
Control plane metrics are exposed on port :5680
and available under the standard path /metrics
.
Traces
Kong Mesh can be configured to export OpenTelemetry traces. It exports traces for:
- API server
- KDS on global
- Note only basic information about the connections to zones are traced, nothing resource specific
- Inter CP server
To enable tracing, set the
KUMA_TRACING_OPENTELEMETRY_ENABLED
/tracing.openTelemetry.enabled
control plane
config variable to "true"
and configure OpenTelemetry using the
standard OTEL_EXPORTER_OTLP_*
environment variables.
Configuring Prometheus
The Kong Mesh community has contributed a builtin service discovery to Prometheus, it is documented in the Prometheus docs. This service discovery will connect to the control plane and retrieve all data planes with enabled metrics which Prometheus will scrape and retrieve metrics according to your traffic metrics setup.
There are 2 ways you can run prometheus:
- Inside the mesh (default for
kumactl install observability
). In this case you can use mTLS to retrieve the metrics. This provides high security but will require one prometheus per mesh and might not be accessible if your mesh becomes unavailable. It will also require one Prometheus deployment per Kong Mesh mesh.Outside the mesh. In this case you’ll need to specify
tls.mode: disabled
in the traffic metrics configuration. This is less secure but ensures Prometheus is as available as possible. It’s also easier to add to an existing setup with services in and outside the mesh.- Outside the mesh with TLS enabled. In this case you’ll need to provide certificates for each dataplane and specify configuration in the traffic metrics configuration. This is more secure than second option but requires more configuration.
In production, we recommend the second option as it provides better visibility when things go wrong, and it’s usually acceptable for metrics to be less secure.
Using an already existing prometheus setup
In Prometheus version 2.29 and later, you can add Kong Mesh metrics to your prometheus.yml
:
scrape_configs:
- job_name: 'kuma-dataplanes'
scrape_interval: "5s"
relabel_configs:
- source_labels:
- __meta_kuma_mesh
regex: "(.*)"
target_label: mesh
- source_labels:
- __meta_kuma_dataplane
regex: "(.*)"
target_label: dataplane
- action: labelmap
regex: __meta_kuma_label_(.+)
kuma_sd_configs:
- server: "http://kong-mesh-control-plane.kong-mesh-system.svc:5676" # replace with the url of your control plane
For more information, see the Prometheus documentation.
If you have traffic metrics enabled for your mesh, check the Targets page in the Prometheus dashboard. You should see a list of data plane proxies from your mesh. For example:
Configuring Grafana
Visualizing traces
To visualise your traces you need to have Grafana up and running.
kumactl install observability
sets this up out of the box.
With Grafana installed you can configure a new datasource with url:http://jaeger-query.mesh-observability/
(or whatever url jaeger can be queried at).
Grafana will then be able to retrieve the traces from Jaeger.
You can then add a TrafficTrace policy to your mesh to start emitting traces. At this point you can visualize your traces in Grafana by choosing the jaeger datasource in the explore section.
Visualizing logs
To visualise your containers’ logs and your access logs you need to have a Grafana up and running.
kumactl install observability
sets this up out of the box.
You can then add a TrafficLog policy to your mesh to start emitting access logs. Loki will pick up logs that are sent to stdout
. To send logs to stdout
you can configure the logging backend as shown below:
At this point you can visualize your containers’ logs and your access logs in Grafana by choosing the loki datasource in the explore section.
For example, running: {container="kuma-sidecar"} |= "GET"
will show all GET requests on your cluster.
To learn more about the search syntax check the Loki docs.
Nice to have
Having your Logs and Traces in the same visualisation tool can come really handy. By adding the
traceId
in your app logs you can visualize your logs and the related Jaeger traces. To learn more about it go read this article.
Grafana extensions
The Kong Mesh community has built a datasource and a set of dashboards to provide great interactions between Kong Mesh and Grafana.
Datasource and service map
The Grafana Datasource is a datasource specifically built to relate information from the control plane with Prometheus metrics.
Current features include:
- Display the graph of your services with the MeshGraph using Grafana nodeGraph panel.
- List meshes.
- List zones.
- List services.
To use the plugin you’ll need to add the binary to your Grafana instance by following the installation instructions.
To make things simpler the datasource is installed and configured when using kumactl install observability
.
Dashboards
Kong Mesh ships with default dashboards that are available to import from the Grafana Labs repository.
Kong Mesh Dataplane
This dashboard lets you investigate the status of a single dataplane in the mesh. In order to see those metrics, you need to create Traffic Metrics policy first.
Kong Mesh Mesh
This dashboard lets you investigate the aggregated statistics of a single mesh. It provides a topology view of your service traffic dependencies (Service Map) and includes information such as number of requests and error rates.
Kong Mesh Service to Service
This dashboard lets you investigate aggregated statistics from dataplanes of specified source services to dataplanes of specified destination service.
Kong Mesh CP
This dashboard lets you investigate control plane statistics.
Kong Mesh Service
This dashboard lets you investigate aggregated statistics for each service.
Kong Mesh MeshGateway
This dashboard lets you investigate aggregated statistics for each builtin gateway.
Configuring Datadog
The recommended way to use Datadog is with its agent.
Metrics
Kong Mesh exposes metrics with traffic metrics in Prometheus format.
You can add annotations to your pods to enable the Datadog agent to scrape metrics.
Tracing
Checkout the
Once the agent is configured to ingest traces you’ll need to configure a TrafficTrace policy.
Logs
The best way to have Kong Mesh and Datadog work together is with TCP ingest.
Once your agent is configured with TCP ingest you can configure a TrafficLog policy for data plane proxies to send logs.
Observability in multi-zone
Kong Mesh is multi-zone at heart. We explain here how to architect your telemetry stack to accommodate multi-zone.
Prometheus
When Kong Mesh is used in multi-zone the recommended approach is to use 1 Prometheus instance in each zone and to send the metrics of each zone to a global Prometheus instance.
Prometheus offers different ways to do this:
- Federation The global Prometheus will scrape Prometheus in each zone.
- Remote Write Prometheus in each zone will directly write metrics to the global, this is meant to be more efficient than the federation.
- Remote Read like remote write, but the other way around.
Jaeger, Loki, Datadog and others
Most telemetry components don’t have a hierarchical setup like Prometheus. If you want to have a central view of everything you can set up the system in global and have each zone send their data to it. Because zone is present in data plane tags you shouldn’t be worried about metrics, logs, and traces overlapping between zones.