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_CLUSTER_MANAGER_ENDPOINT=... overrides the EndpointOption (which defaults to "container.googleapis.com") used by MakeClusterManagerConnection().
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 2025-03-05 UTC."],[[["This document outlines environment variables and configuration options for a C++ library, including version history and links to detailed documentation."],["The library offers environment variables to configure its behavior, useful for troubleshooting, with functions available to achieve this in code, and they can be used to override default endpoints for certain services."],["Tracing can be enabled for gRPC calls using `GOOGLE_CLOUD_CPP_ENABLE_TRACING`, which is useful for debugging when coupled with console output enabled by `GOOGLE_CLOUD_CPP_ENABLE_CLOG`."],["Different tracing behaviors can be configured using `GOOGLE_CLOUD_CPP_TRACING_OPTIONS`, such as formatting and truncation, and there are also links to documentation for the `google::cloud::TracingComponentsOption` and `google::cloud::GrpcTracingOptionsOption` classes."],["The `GOOGLE_CLOUD_PROJECT` environment variable can be used in examples and tests to configure the GCP project, but it does not affect the behavior of the library itself."]]],[]]
