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_ACCESS_CONTEXT_MANAGER_ENDPOINT=... overrides the EndpointOption (which defaults to "accesscontextmanager.googleapis.com") used by MakeAccessContextManagerConnection().
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::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 2025-03-05 UTC."],[[["The latest release candidate version is 2.37.0-rc, with version 2.30.0 being the current displayed version, and the page also lists many older versions down to 2.11.0, all of which are accessible via links."],["Environment variables like `GOOGLE_CLOUD_CPP_ACCESS_CONTEXT_MANAGER_ENDPOINT` can be utilized to override default settings, such as the endpoint used by `MakeAccessContextManagerConnection()`."],["Tracing for gRPC calls can be enabled by setting `GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc`, and `GOOGLE_CLOUD_CPP_ENABLE_CLOG` will ensure the output is printed on the program's console."],["The behavior of gRPC tracing can be modified using the `GOOGLE_CLOUD_CPP_TRACING_OPTIONS` environment variable, which can control aspects like multi-line outputs or field truncation."],["`GOOGLE_CLOUD_CPP_ENABLE_CLOG=yes` turns on logging in the library, however the logging infrastructure needs a backend or this variable to actually print it."]]],[]]
