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_DEP_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "networkservices.googleapis.com") used by MakeDepServiceConnection().
GOOGLE_CLOUD_CPP_NETWORK_SERVICES_ENDPOINT=... overrides the EndpointOption (which defaults to "networkservices.googleapis.com") used by MakeNetworkServicesConnection().
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 2025-03-21 UTC."],[[["The latest version available is 2.37.0-rc, with numerous other versions, such as 2.36.0, 2.35.0, and down to 2.12.0, also being accessible."],["Environment variables provide a way to configure the library's behavior and are particularly useful for troubleshooting, with examples of such variables including `GOOGLE_CLOUD_CPP_DEP_SERVICE_ENDPOINT` and `GOOGLE_CLOUD_CPP_NETWORK_SERVICES_ENDPOINT` for overriding endpoint options."],["Tracing for gRPC calls can be enabled via the `GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc` environment variable, which, in conjunction with `GOOGLE_CLOUD_CPP_ENABLE_CLOG`, will print the output to the console."],["The `GOOGLE_CLOUD_CPP_TRACING_OPTIONS` environment variable allows modification of gRPC tracing behavior, including adjusting the format and truncation of output messages."],["Setting `GOOGLE_CLOUD_CPP_ENABLE_CLOG=yes` enables logging within the library by providing a backend, allowing for visibility into the library's internal operations, regardless of whether the user application has configured a backend or not."]]],[]]
