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_ESSENTIAL_CONTACTS_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "essentialcontacts.googleapis.com") used by MakeEssentialContactsServiceConnection().
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 2025-03-14 UTC."],[[["The latest version available for the Essential Contacts service is 2.37.0-rc, which is accessible via the provided link, followed by a series of previous versions ranging from 2.36.0 down to 2.12.0."],["Environment variables such as `GOOGLE_CLOUD_CPP_ESSENTIAL_CONTACTS_SERVICE_ENDPOINT` can be utilized to override the default endpoint used by `MakeEssentialContactsServiceConnection()`, allowing for custom configuration."],["Tracing for gRPC calls can be enabled using `GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc`, and additional logging output can be achieved by setting `GOOGLE_CLOUD_CPP_ENABLE_CLOG`."],["The behavior of gRPC tracing can be modified using `GOOGLE_CLOUD_CPP_TRACING_OPTIONS`, allowing for customization such as multiline output and string/bytes field truncation."],["`GOOGLE_CLOUD_PROJECT` environment variable is used to configure the GCP project in examples and integration tests, but it does not affect the library."]]],[]]
