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_APIGEE_CONNECTION_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "apigeeconnect.googleapis.com") used by MakeConnection().
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, with a list of versions ranging down to 2.11.0, each with their own linked documentation."],["Environment variables like `GOOGLE_CLOUD_CPP_APIGEE_CONNECTION_SERVICE_ENDPOINT` can override default settings such as the endpoint used by `MakeConnection()`."],["The environment variable `GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc` enables tracing for most gRPC calls, and can be used with `GOOGLE_CLOUD_CPP_ENABLE_CLOG` to log any output to the program's console."],["`GOOGLE_CLOUD_CPP_TRACING_OPTIONS` allows the user to modify the behavior of gRPC tracing, such as output format and field truncation."],["`GOOGLE_CLOUD_PROJECT` is used to set the GCP project in examples and tests, however, it does not modify the library itself."]]],[]]
