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 2025-04-17 UTC."],[[["The latest version available is 2.37.0-rc, with numerous other versions from 2.36.0 down to 2.11.0 also documented."],["Environment variables can be used to configure the library's behavior, such as endpoint overrides via `GOOGLE_CLOUD_CPP_MANAGED_IDENTITIES_SERVICE_ENDPOINT`."],["Logging and tracing for gRPC calls can be enabled and modified using variables like `GOOGLE_CLOUD_CPP_ENABLE_TRACING` and `GOOGLE_CLOUD_CPP_TRACING_OPTIONS`."],["The environment variable `GOOGLE_CLOUD_CPP_ENABLE_CLOG` can be used to enable logging output to the program's console."],["`GOOGLE_CLOUD_PROJECT` is an environment variable that configures the GCP project for examples and integration testing, but it does not have an effect within the library."]]],[]]
