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_ARTIFACT_REGISTRY_ENDPOINT=...overrides theEndpointOption(which defaults to "artifactregistry.googleapis.com") used byMakeArtifactRegistryConnection().
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.
[[["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 outlines environment variables and settings for configuring the behavior of the Artifact Registry C++ client library, offering control over endpoints, logging, and tracing.\u003c/p\u003e\n"],["\u003cp\u003eThe latest release candidate for the Artifact Registry C++ library is version 2.37.0-rc, with numerous previous versions available, ranging from 2.11.0 up to 2.36.0, all documented on this page.\u003c/p\u003e\n"],["\u003cp\u003eYou can override the default endpoint ("artifactregistry.googleapis.com") for the library using the \u003ccode\u003eGOOGLE_CLOUD_CPP_ARTIFACT_REGISTRY_ENDPOINT\u003c/code\u003e environment variable.\u003c/p\u003e\n"],["\u003cp\u003eEnabling gRPC tracing can be achieved by setting \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc\u003c/code\u003e, and further customization of the tracing behavior is possible via \u003ccode\u003eGOOGLE_CLOUD_CPP_TRACING_OPTIONS\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003eSetting \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_CLOG=yes\u003c/code\u003e activates logging within the library, allowing for the display of log information, and the \u003ccode\u003eGOOGLE_CLOUD_PROJECT\u003c/code\u003e variable will set the default project to be used in the examples and integration tests.\u003c/p\u003e\n"]]],[],null,["Version 2.20.0keyboard_arrow_down\n\n- [2.42.0-rc (latest)](/cpp/docs/reference/artifactregistry/latest/artifactregistry-env)\n- [2.41.0](/cpp/docs/reference/artifactregistry/2.41.0/artifactregistry-env)\n- [2.40.0](/cpp/docs/reference/artifactregistry/2.40.0/artifactregistry-env)\n- [2.39.0](/cpp/docs/reference/artifactregistry/2.39.0/artifactregistry-env)\n- [2.38.0](/cpp/docs/reference/artifactregistry/2.38.0/artifactregistry-env)\n- [2.37.0](/cpp/docs/reference/artifactregistry/2.37.0/artifactregistry-env)\n- [2.36.0](/cpp/docs/reference/artifactregistry/2.36.0/artifactregistry-env)\n- [2.35.0](/cpp/docs/reference/artifactregistry/2.35.0/artifactregistry-env)\n- [2.34.0](/cpp/docs/reference/artifactregistry/2.34.0/artifactregistry-env)\n- [2.33.0](/cpp/docs/reference/artifactregistry/2.33.0/artifactregistry-env)\n- [2.32.0](/cpp/docs/reference/artifactregistry/2.32.0/artifactregistry-env)\n- [2.31.0](/cpp/docs/reference/artifactregistry/2.31.0/artifactregistry-env)\n- [2.30.0](/cpp/docs/reference/artifactregistry/2.30.0/artifactregistry-env)\n- [2.29.0](/cpp/docs/reference/artifactregistry/2.29.0/artifactregistry-env)\n- [2.28.0](/cpp/docs/reference/artifactregistry/2.28.0/artifactregistry-env)\n- [2.27.0](/cpp/docs/reference/artifactregistry/2.27.0/artifactregistry-env)\n- [2.26.0](/cpp/docs/reference/artifactregistry/2.26.0/artifactregistry-env)\n- [2.25.1](/cpp/docs/reference/artifactregistry/2.25.1/artifactregistry-env)\n- [2.24.0](/cpp/docs/reference/artifactregistry/2.24.0/artifactregistry-env)\n- [2.23.0](/cpp/docs/reference/artifactregistry/2.23.0/artifactregistry-env)\n- [2.22.1](/cpp/docs/reference/artifactregistry/2.22.1/artifactregistry-env)\n- [2.21.0](/cpp/docs/reference/artifactregistry/2.21.0/artifactregistry-env)\n- [2.20.0](/cpp/docs/reference/artifactregistry/2.20.0/artifactregistry-env)\n- [2.19.0](/cpp/docs/reference/artifactregistry/2.19.0/artifactregistry-env)\n- [2.18.0](/cpp/docs/reference/artifactregistry/2.18.0/artifactregistry-env)\n- [2.17.0](/cpp/docs/reference/artifactregistry/2.17.0/artifactregistry-env)\n- [2.16.0](/cpp/docs/reference/artifactregistry/2.16.0/artifactregistry-env)\n- [2.15.1](/cpp/docs/reference/artifactregistry/2.15.1/artifactregistry-env)\n- [2.14.0](/cpp/docs/reference/artifactregistry/2.14.0/artifactregistry-env)\n- [2.13.0](/cpp/docs/reference/artifactregistry/2.13.0/artifactregistry-env)\n- [2.12.0](/cpp/docs/reference/artifactregistry/2.12.0/artifactregistry-env)\n- [2.11.0](/cpp/docs/reference/artifactregistry/2.11.0/artifactregistry-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_ARTIFACT_REGISTRY_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"artifactregistry.googleapis.com\") used by `MakeArtifactRegistryConnection()`.\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`](https://cloud.google.com/cpp/docs/reference/common/latest/structgoogle_1_1cloud_1_1TracingComponentsOption.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."]]
