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."],[[["The latest version of the service usage documentation is 2.37.0-rc, with the page providing access to documentation for multiple other versions, including 2.36.0 down to 2.11.0."],["Environment variables can be used to configure the library's behavior, particularly helpful when troubleshooting, and can be overridden by functions configured in code."],["`GOOGLE_CLOUD_CPP_SERVICE_USAGE_ENDPOINT` can override the default endpoint used by `MakeServiceUsageConnection()`."],["Tracing of gRPC calls can be enabled by setting `GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc`, which will output logs to the console when combined with the variable `GOOGLE_CLOUD_CPP_ENABLE_CLOG`."],["`GOOGLE_CLOUD_PROJECT` is used in examples and integration testing and does not affect the library."]]],[]]
