package xds.service.orca.v3

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Out-of-band (OOB) load reporting service for the additional load reporting agent that does not sit in the request path. Reports are periodically sampled with sufficient frequency to provide temporal association with requests. OOB reporting compensates the limitation of in-band reporting in revealing costs for backends that do not provide a steady stream of telemetry such as long running stream operations and zero QPS services. This is a server streaming service, client needs to terminate current RPC and initiate a new call to change backend reporting frequency.

• rpc StreamCoreMetrics (OrcaLoadReportRequest, stream data.orca.v3.OrcaLoadReport)

  orca.proto:26

  message OrcaLoadReportRequest

  orca.proto:29

  • optional google.protobuf.Duration report_interval = 1

    Interval for generating Open RCA core metric responses.

  • repeated string request_cost_names = 2

    Request costs to collect. If this is empty, all known requests costs tracked by the load reporting agent will be returned. This provides an opportunity for the client to selectively obtain a subset of tracked costs.