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_ADVISORY_NOTIFICATIONS_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "advisorynotifications.googleapis.com") used by MakeAdvisoryNotificationsServiceConnection().
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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14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 Advisory Notifications 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 like \u003ccode\u003eGOOGLE_CLOUD_CPP_ADVISORY_NOTIFICATIONS_SERVICE_ENDPOINT\u003c/code\u003e can override the default endpoint, and variables like \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_TRACING\u003c/code\u003e and \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_CLOG\u003c/code\u003e are used to enable gRPC call tracing and library logging, respectively.\u003c/p\u003e\n"],["\u003cp\u003eThe environment variable \u003ccode\u003eGOOGLE_CLOUD_PROJECT\u003c/code\u003e is utilized in examples and integration tests to set the GCP project but does not impact the library's behavior.\u003c/p\u003e\n"],["\u003cp\u003eThere are also links provided to learn more about features, such as \u003ccode\u003egoogle::cloud::EndpointOption\u003c/code\u003e, \u003ccode\u003egoogle::cloud::TracingComponentsOption\u003c/code\u003e, \u003ccode\u003egoogle::cloud::GrpcTracingOptionsOption\u003c/code\u003e, \u003ccode\u003egoogle::cloud::LogBackend\u003c/code\u003e, and \u003ccode\u003egoogle::cloud::LogSink\u003c/code\u003e, which are relevant to the behaviour of the library.\u003c/p\u003e\n"]]],[],null,[]]
