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_CLOUD_QUOTAS_ENDPOINT=...overrides theEndpointOption(which defaults to "cloudquotas.googleapis.com") used byMakeCloudQuotasConnection().
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 setGOOGLE_CLOUD_CPP_ENABLE_CLOGto produce any output on the program's console.
See Also
google::cloud::LoggingComponentsOptionGOOGLE_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.
GOOGLE_CLOUD_PROJECT=...: is used in examples and integration tests to configure the GCP project. This has no effect in the library.
Setting the Quota Project
GOOGLE_CLOUD_CPP_USER_PROJECT=...: can be used to set the quota project when using Application Default Credentials. See seeTroubleshoot your ADC setupfor more details.
[[["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 2025-09-04 UTC."],[[["\u003cp\u003eThe latest version available is 2.37.0-rc, with multiple previous versions, such as 2.36.0, 2.35.0, and so on, also listed on the page.\u003c/p\u003e\n"],["\u003cp\u003eEnvironment variables can be utilized to modify the library's behavior, which is useful when debugging issues.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eGOOGLE_CLOUD_CPP_CLOUD_QUOTAS_ENDPOINT\u003c/code\u003e allows for overriding the default endpoint used by \u003ccode\u003eMakeCloudQuotasConnection()\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003eTracing can be enabled for gRPC calls by setting \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc\u003c/code\u003e, and output can be directed to the console by also setting \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_CLOG\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eGOOGLE_CLOUD_CPP_USER_PROJECT\u003c/code\u003e can be used to set the quota project when using Application Default Credentials.\u003c/p\u003e\n"]]],[],null,["Version latestkeyboard_arrow_down\n\n- [2.42.0-rc (latest)](/cpp/docs/reference/cloudquotas/latest/cloudquotas-env)\n- [2.41.0](/cpp/docs/reference/cloudquotas/2.41.0/cloudquotas-env)\n- [2.40.0](/cpp/docs/reference/cloudquotas/2.40.0/cloudquotas-env)\n- [2.39.0](/cpp/docs/reference/cloudquotas/2.39.0/cloudquotas-env)\n- [2.38.0](/cpp/docs/reference/cloudquotas/2.38.0/cloudquotas-env)\n- [2.37.0](/cpp/docs/reference/cloudquotas/2.37.0/cloudquotas-env)\n- [2.36.0](/cpp/docs/reference/cloudquotas/2.36.0/cloudquotas-env)\n- [2.35.0](/cpp/docs/reference/cloudquotas/2.35.0/cloudquotas-env)\n- [2.34.0](/cpp/docs/reference/cloudquotas/2.34.0/cloudquotas-env)\n- [2.33.0](/cpp/docs/reference/cloudquotas/2.33.0/cloudquotas-env)\n- [2.32.0](/cpp/docs/reference/cloudquotas/2.32.0/cloudquotas-env)\n- [2.31.0](/cpp/docs/reference/cloudquotas/2.31.0/cloudquotas-env)\n- [2.30.0](/cpp/docs/reference/cloudquotas/2.30.0/cloudquotas-env)\n- [2.29.0](/cpp/docs/reference/cloudquotas/2.29.0/cloudquotas-env)\n- [2.28.0](/cpp/docs/reference/cloudquotas/2.28.0/cloudquotas-env)\n- [2.27.0](/cpp/docs/reference/cloudquotas/2.27.0/cloudquotas-env)\n- [2.26.0](/cpp/docs/reference/cloudquotas/2.26.0/cloudquotas-env)\n- [2.25.1](/cpp/docs/reference/cloudquotas/2.25.1/cloudquotas-env)\n- [2.24.0](/cpp/docs/reference/cloudquotas/2.24.0/cloudquotas-env)\n- [2.23.0](/cpp/docs/reference/cloudquotas/2.23.0/cloudquotas-env)\n- [2.22.1](/cpp/docs/reference/cloudquotas/2.22.1/cloudquotas-env)\n- [2.21.0](/cpp/docs/reference/cloudquotas/2.21.0/cloudquotas-env)\n- [2.20.0](/cpp/docs/reference/cloudquotas/2.20.0/cloudquotas-env) \n\nEnvironment Variables\n=====================\n\nA 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.\n\nEndpoint Overrides\n------------------\n\n- `GOOGLE_CLOUD_CPP_CLOUD_QUOTAS_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"cloudquotas.googleapis.com\") used by `MakeCloudQuotasConnection()`.\n\n###### See Also\n\n[`google::cloud::EndpointOption`](https://cloud.google.com/cpp/docs/reference/common/latest/structgoogle_1_1cloud_1_1EndpointOption.html)\n\nLogging\n-------\n\n`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.\n\n###### See Also\n\n[`google::cloud::LoggingComponentsOption`](https://cloud.google.com/cpp/docs/reference/common/latest/structgoogle_1_1cloud_1_1LoggingComponentsOption.html)`GOOGLE_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.\n\n###### See Also\n\n[`google::cloud::GrpcTracingOptionsOption`](https://cloud.google.com/cpp/docs/reference/common/latest/structgoogle_1_1cloud_1_1GrpcTracingOptionsOption.html)`GOOGLE_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.\n\n###### See Also\n\n[`google::cloud::LogBackend`](https://cloud.google.com/cpp/docs/reference/common/latest/classgoogle_1_1cloud_1_1LogBackend.html)\n\n###### See Also\n\n[`google::cloud::LogSink`](https://cloud.google.com/cpp/docs/reference/common/latest/classgoogle_1_1cloud_1_1LogSink.html)\n\nSetting the Default Project\n---------------------------\n\n`GOOGLE_CLOUD_PROJECT=...`: is used in examples and integration tests to configure the GCP project. This has no effect in the library.\n\nSetting the Quota Project\n-------------------------\n\n`GOOGLE_CLOUD_CPP_USER_PROJECT=...`: can be used to set the quota project when using Application Default Credentials. See see [Troubleshoot your ADC setup](https://cloud.google.com/docs/authentication/adc-troubleshooting/user-creds) for more details."]]
