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This feature is in beta. It may be subject to changes and improvements based on user feedback.

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Considerations

Before enabling the Service Name Sampler, please consider the following:
  • Only supports traces.
  • Sampling is trace-wide: either all spans in a trace are kept, or all are dropped.
  • The sampler introduces a delay of up to 30 seconds before traces are exported.
  • Traces with durations longer than 30 seconds might not be sampled correctly.

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Use Cases

Targeted Trace Collection
  • Collect only traces involving specific microservices, such as auth-service, for debugging or focused observability.
Cost Reduction
  • Significantly reduce collected trace volume by focusing on services that matter most.

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Configuration Options

The ServiceNameSampler action is configured using the odigos.io/v1alpha1.Action CRD with the samplers configuration section.
actionName string: A human-readable name for the action.
  • Optional
  • Odigos does not use or assume any meaning from this field
notes string: Free-form notes to describe the purpose or intent of this sampler.
  • Optional
  • Odigos does not use or assume any meaning from this field
disabled boolean: Temporarily disables this sampler without deleting its configuration.
  • Optional, defaults to false
signals string[]: The signal types this action will operate on.
  • Required
  • Only TRACES is supported.
samplers object : Configuration for sampling actions.
  • This field is required for this action type
serviceNameSampler object : Configuration for the ServiceNameSampler.
  • This field is required for this action type
services_name_filters object[] : An array of objects representing the filters for the services.
  • This field is required
service_name string : Specifies the service name to search within the trace (Across all available spans).
  • This field is required
sampling_ratio float : Specifies the sample rate for all traces that contains service_name.
  • This field is required
fallback_sampling_ratio float : Specifies the percentage of traces that don’t meet the service name filter and that you still like to retain.
  • This field is required
A trace is sampled if it contains at least one span from a service listed in services_name_filters and passes the sampling_ratio check. Traces without any listed services may still be sampled based on the corresponding fallback_sampling_ratio.

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Basic Example

This example samples 100% of traces that contain coupon-service and 0% of all other traces using the new Action CRD:
1

Create a YAML file with the following content:
service-name-sampler.yaml
apiVersion: odigos.io/v1alpha1
kind: Action
metadata:
  name: coupon-service-sampler
  namespace: odigos-system
spec:
  actionName: "coupon-sampler"
  signals:
    - TRACES
  samplers:
    serviceNameSampler:
      services_name_filters:
        - service_name: coupon-service
          sampling_ratio: 100
          fallback_sampling_ratio: 0
2

Apply the sampler:
kubectl apply -f service-name-sampler.yaml

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Advanced Example

This example collects:
  • 100% of traces with payment-service
  • 50% of traces with auth-service
  • 10% of traces that include neither of the above
advanced-service-name-sampler.yaml
apiVersion: odigos.io/v1alpha1
kind: Action
metadata:
  name: multi-service-sampler
  namespace: odigos-system
spec:
  actionName: "multi-service-focus"
  signals:
    - TRACES
  samplers:
    serviceNameSampler:
      services_name_filters:
        - service_name: payment-service
          sampling_ratio: 100
          fallback_sampling_ratio: 10
        - service_name: auth-service
          sampling_ratio: 50
          fallback_sampling_ratio: 10
This setup ensures you always keep critical traces and still retain a sample of the rest for broader context.