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_CHANNEL_REPORTS_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "cloudchannel.googleapis.com") used by MakeCloudChannelReportsServiceConnection().
GOOGLE_CLOUD_CPP_CLOUD_CHANNEL_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "cloudchannel.googleapis.com") used by MakeCloudChannelServiceConnection().
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"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14 UTC."],[[["\u003cp\u003eThis page provides documentation for various versions of the Cloud Channel C++ library, ranging from version 2.11.0 up to the latest release candidate, 2.37.0-rc.\u003c/p\u003e\n"],["\u003cp\u003eEnvironment variables can be utilized to configure the library's behavior, and there are also in-code functions that allow you to configure it as well.\u003c/p\u003e\n"],["\u003cp\u003eYou can use environment variables like \u003ccode\u003eGOOGLE_CLOUD_CPP_CLOUD_CHANNEL_REPORTS_SERVICE_ENDPOINT\u003c/code\u003e and \u003ccode\u003eGOOGLE_CLOUD_CPP_CLOUD_CHANNEL_SERVICE_ENDPOINT\u003c/code\u003e to override the default endpoints for specific services.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc\u003c/code\u003e variable allows for enabling tracing on gRPC calls, whereas \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_CLOG=yes\u003c/code\u003e enables logging within the library.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eGOOGLE_CLOUD_PROJECT\u003c/code\u003e variable can be set for GCP project configuration in examples and integration tests, although it has no impact on the library itself.\u003c/p\u003e\n"]]],[],null,["Version 2.18.0keyboard_arrow_down\n\n- [2.42.0-rc (latest)](/cpp/docs/reference/channel/latest/channel-env)\n- [2.41.0](/cpp/docs/reference/channel/2.41.0/channel-env)\n- [2.40.0](/cpp/docs/reference/channel/2.40.0/channel-env)\n- [2.39.0](/cpp/docs/reference/channel/2.39.0/channel-env)\n- [2.38.0](/cpp/docs/reference/channel/2.38.0/channel-env)\n- [2.37.0](/cpp/docs/reference/channel/2.37.0/channel-env)\n- [2.36.0](/cpp/docs/reference/channel/2.36.0/channel-env)\n- [2.35.0](/cpp/docs/reference/channel/2.35.0/channel-env)\n- [2.34.0](/cpp/docs/reference/channel/2.34.0/channel-env)\n- [2.33.0](/cpp/docs/reference/channel/2.33.0/channel-env)\n- [2.32.0](/cpp/docs/reference/channel/2.32.0/channel-env)\n- [2.31.0](/cpp/docs/reference/channel/2.31.0/channel-env)\n- [2.30.0](/cpp/docs/reference/channel/2.30.0/channel-env)\n- [2.29.0](/cpp/docs/reference/channel/2.29.0/channel-env)\n- [2.28.0](/cpp/docs/reference/channel/2.28.0/channel-env)\n- [2.27.0](/cpp/docs/reference/channel/2.27.0/channel-env)\n- [2.26.0](/cpp/docs/reference/channel/2.26.0/channel-env)\n- [2.25.1](/cpp/docs/reference/channel/2.25.1/channel-env)\n- [2.24.0](/cpp/docs/reference/channel/2.24.0/channel-env)\n- [2.23.0](/cpp/docs/reference/channel/2.23.0/channel-env)\n- [2.22.1](/cpp/docs/reference/channel/2.22.1/channel-env)\n- [2.21.0](/cpp/docs/reference/channel/2.21.0/channel-env)\n- [2.20.0](/cpp/docs/reference/channel/2.20.0/channel-env)\n- [2.19.0](/cpp/docs/reference/channel/2.19.0/channel-env)\n- [2.18.0](/cpp/docs/reference/channel/2.18.0/channel-env)\n- [2.17.0](/cpp/docs/reference/channel/2.17.0/channel-env)\n- [2.16.0](/cpp/docs/reference/channel/2.16.0/channel-env)\n- [2.15.1](/cpp/docs/reference/channel/2.15.1/channel-env)\n- [2.14.0](/cpp/docs/reference/channel/2.14.0/channel-env)\n- [2.13.0](/cpp/docs/reference/channel/2.13.0/channel-env)\n- [2.12.0](/cpp/docs/reference/channel/2.12.0/channel-env)\n- [2.11.0](/cpp/docs/reference/channel/2.11.0/channel-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_CHANNEL_REPORTS_SERVICE_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"cloudchannel.googleapis.com\") used by `MakeCloudChannelReportsServiceConnection()`.\n- `GOOGLE_CLOUD_CPP_CLOUD_CHANNEL_SERVICE_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"cloudchannel.googleapis.com\") used by `MakeCloudChannelServiceConnection()`.\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."]]
