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_MIGRATION_CENTER_ENDPOINT=... overrides the EndpointOption (which defaults to "migrationcenter.googleapis.com") used by MakeMigrationCenterConnection().
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 2025-04-23 UTC."],[[["The webpage provides documentation for various versions of the Migration Center library, ranging from version 2.13.0 up to the release candidate 2.37.0-rc, with version 2.36.0 being the currently displayed version."],["Environment variables can be used to configure the behavior of the Migration Center library, particularly useful for troubleshooting, with the `GOOGLE_CLOUD_CPP_MIGRATION_CENTER_ENDPOINT` variable used for endpoint overrides."],["Tracing and logging for gRPC calls can be enabled using `GOOGLE_CLOUD_CPP_ENABLE_TRACING` and `GOOGLE_CLOUD_CPP_ENABLE_CLOG` environment variables, respectively, allowing for detailed inspection of requests and responses."],["The `GOOGLE_CLOUD_CPP_TRACING_OPTIONS` environment variable allows for customization of gRPC tracing behavior, such as adjusting message output format and field truncation, providing more granular control over tracing logs."]]],[]]
