A number of environment variables can be used to configure the behavior of the library. There are also functions to configure this behavior in code. The environment variables are convenient when troubleshooting problems.
Endpoint Overrides
GOOGLE_CLOUD_CPP_SERVICE_USAGE_ENDPOINT=... overrides the EndpointOption (which defaults to "serviceusage.googleapis.com") used by MakeServiceUsageConnection().
GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc: turns on tracing for most gRPC calls. The library injects an additional Stub decorator that prints each gRPC request and response. Unless you have configured your own logging backend, you should also set GOOGLE_CLOUD_CPP_ENABLE_CLOG to produce any output on the program's console.
See Also
google::cloud::TracingComponentsOptionGOOGLE_CLOUD_CPP_TRACING_OPTIONS=...: modifies the behavior of gRPC tracing, including whether messages will be output on multiple lines, or whether string/bytes fields will be truncated.
See Also
google::cloud::GrpcTracingOptionsOptionGOOGLE_CLOUD_CPP_ENABLE_CLOG=yes: turns on logging in the library, basically the library always "logs" but the logging infrastructure has no backend to actually print anything until the application sets a backend or they set this environment variable.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-03-21 UTC."],[[["This document details environment variables and configuration options for the Service Usage C++ library, including versions ranging from 2.11.0 up to the latest release candidate 2.37.0-rc."],["The `GOOGLE_CLOUD_CPP_SERVICE_USAGE_ENDPOINT` variable allows users to override the default endpoint used by `MakeServiceUsageConnection()`."],["Users can enable detailed gRPC call tracing by setting `GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc`, and can configure the output of the tracing by the variable `GOOGLE_CLOUD_CPP_TRACING_OPTIONS`."],["Setting `GOOGLE_CLOUD_CPP_ENABLE_CLOG=yes` enables logging output from the library to the console."],["While `GOOGLE_CLOUD_PROJECT` can be set to configure the GCP project in examples and tests, it does not directly affect the library's functionality."]]],[]]
