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::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.
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\u003eThis document provides environment variable configurations and version history for the Cloud Quotas C++ client library, with the latest release candidate being version 2.37.0-rc.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eGOOGLE_CLOUD_CPP_CLOUD_QUOTAS_ENDPOINT\u003c/code\u003e variable allows overriding the default endpoint for the \u003ccode\u003eMakeCloudQuotasConnection()\u003c/code\u003e function.\u003c/p\u003e\n"],["\u003cp\u003eTracing of gRPC calls can be enabled by setting \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc\u003c/code\u003e, and its behavior can be modified using \u003ccode\u003eGOOGLE_CLOUD_CPP_TRACING_OPTIONS\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_CLOG=yes\u003c/code\u003e variable enables logging in the library, allowing output to the console if no custom logging backend is configured.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eGOOGLE_CLOUD_CPP_USER_PROJECT\u003c/code\u003e is used to set the quota project when employing Application Default Credentials.\u003c/p\u003e\n"]]],[],null,["Version 2.24.0keyboard_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::TracingComponentsOption`](about:invalid#zCSafez)`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."]]
