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_QUOTA_CONTROLLER_ENDPOINT=... overrides the EndpointOption (which defaults to "servicecontrol.googleapis.com") used by MakeQuotaControllerConnection().
GOOGLE_CLOUD_CPP_SERVICE_CONTROLLER_ENDPOINT=... overrides the EndpointOption (which defaults to "servicecontrol.googleapis.com") used by MakeServiceControllerConnection().
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 release candidate version is 2.37.0-rc, and there are a variety of other versions available, ranging down to version 2.11.0, all of which can be found via links to their documentation."],["Environment variables can be utilized to adjust the library's behavior, and they prove particularly useful during troubleshooting."],["Specific endpoint overrides can be set using `GOOGLE_CLOUD_CPP_QUOTA_CONTROLLER_ENDPOINT` and `GOOGLE_CLOUD_CPP_SERVICE_CONTROLLER_ENDPOINT` variables, allowing users to change the default endpoint."],["Tracing and logging can be enabled using `GOOGLE_CLOUD_CPP_ENABLE_TRACING` and `GOOGLE_CLOUD_CPP_ENABLE_CLOG` respectively, providing insights into gRPC calls and library operations."],["The `GOOGLE_CLOUD_PROJECT` variable is used for examples and tests to configure the GCP project but does not have an effect within the library."]]],[]]
