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 2025-03-14 UTC."],[[["The webpage provides documentation for various versions of the managed identities library, ranging from version 2.11.0 up to the latest release candidate 2.37.0-rc."],["Environment variables, such as `GOOGLE_CLOUD_CPP_MANAGED_IDENTITIES_SERVICE_ENDPOINT`, can be utilized to customize the library's behavior, including overriding the default endpoint for managed identities service connections."],["The library supports tracing for gRPC calls via `GOOGLE_CLOUD_CPP_ENABLE_TRACING`, and `GOOGLE_CLOUD_CPP_ENABLE_CLOG` should also be set to see the tracing output on the console."],["`GOOGLE_CLOUD_CPP_TRACING_OPTIONS` environment variable can be used to further customize the behavior of gRPC tracing, including the format and truncation of messages."],["`GOOGLE_CLOUD_PROJECT` can be used to set a GCP project in examples and tests, but has no effect in the library itself."]]],[]]
