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_SERVICE_HEALTH_ENDPOINT=... overrides the EndpointOption (which defaults to "servicehealth.googleapis.com") used by MakeServiceHealthConnection().
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 release candidate version is 2.37.0-rc, and the page provides documentation links for versions ranging from 2.21.0 up to 2.36.0."],["Environment variables like `GOOGLE_CLOUD_CPP_SERVICE_HEALTH_ENDPOINT` can be used to customize library behavior, such as overriding the default endpoint used by `MakeServiceHealthConnection()`."],["Tracing for gRPC calls can be enabled by setting `GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc`, and output to the console requires `GOOGLE_CLOUD_CPP_ENABLE_CLOG` to also be set."],["The variable `GOOGLE_CLOUD_CPP_TRACING_OPTIONS` controls the behavior of gRPC tracing, affecting output formatting, while `GOOGLE_CLOUD_CPP_ENABLE_CLOG=yes` enables logging in the library."],["`GOOGLE_CLOUD_PROJECT` can be used for examples and integration testing, however it will not have any effect in the library."]]],[]]
