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 theEndpointOption(which defaults to "cloudchannel.googleapis.com") used byMakeCloudChannelReportsServiceConnection().
GOOGLE_CLOUD_CPP_CLOUD_CHANNEL_SERVICE_ENDPOINT=...overrides theEndpointOption(which defaults to "cloudchannel.googleapis.com") used byMakeCloudChannelServiceConnection().
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.
[[["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 page lists the available versions of the C++ Cloud Channel library, ranging from the latest release candidate 2.37.0-rc down to version 2.11.0.\u003c/p\u003e\n"],["\u003cp\u003eThe page documents environment variables used to configure the library's behavior, which are primarily useful for troubleshooting.\u003c/p\u003e\n"],["\u003cp\u003eYou can override default endpoint settings for the Cloud Channel Reports and Cloud Channel services using specific environment variables.\u003c/p\u003e\n"],["\u003cp\u003eSeveral environment variables are described to control logging and tracing for gRPC calls, including options to enable detailed output and configure the formatting.\u003c/p\u003e\n"],["\u003cp\u003eSetting the \u003ccode\u003eGOOGLE_CLOUD_PROJECT\u003c/code\u003e environment variable is only useful for examples and integration tests and does not effect the library.\u003c/p\u003e\n"]]],[],null,["Version 2.27.0keyboard_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::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."]]
