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_MANAGED_IDENTITIES_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "managedidentities.googleapis.com") used by MakeManagedIdentitiesServiceConnection().
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"]],[["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 2025-03-21 UTC."],[[["The latest version of the managed identities environment is `2.37.0-rc`, and numerous prior versions are also available, dating back to `2.11.0`."],["Environment variables, such as `GOOGLE_CLOUD_CPP_MANAGED_IDENTITIES_SERVICE_ENDPOINT`, can be used to override the default endpoint used by `MakeManagedIdentitiesServiceConnection()`."],["Tracing for gRPC calls can be enabled by setting the environment variable `GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc`, and output to the console can also be produced by setting `GOOGLE_CLOUD_CPP_ENABLE_CLOG`."],["The behavior of gRPC tracing, such as output format and truncation of string/bytes fields, can be modified using `GOOGLE_CLOUD_CPP_TRACING_OPTIONS`."],["The `GOOGLE_CLOUD_PROJECT` environment variable is utilized for configuration within examples and integration tests but does not impact the library itself."]]],[]]
