istio.io/content/en/docs/reference/glossary/workload-instance.md

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Workload Instance

A single instantiation of a workload's binary. A workload instance can expose zero or more service endpoints, and can consume zero or more services.

Workload instances have a number of properties:

  • Name and namespace
  • Unique ID
  • IP Address
  • Labels
  • Principal

These properties are available in policy and telemetry configuration using the many source.* and destination.* attributes.