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_FLEET_ROUTING_ENDPOINT=... overrides the EndpointOption (which defaults to "cloudoptimization.googleapis.com") used by MakeFleetRoutingConnection().
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."],[[["This document provides an overview of various versions of a C++ library, ranging from version 2.11.0 up to the release candidate 2.37.0-rc, with links to specific optimization environment configurations for each version."],["Environment variables can be utilized to fine-tune the library's functionality and behavior, offering convenient troubleshooting options."],["`GOOGLE_CLOUD_CPP_FLEET_ROUTING_ENDPOINT` enables users to override the default endpoint used by `MakeFleetRoutingConnection()`, providing flexibility in managing connection destinations."],["Tracing for gRPC calls can be activated with `GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc`, and `GOOGLE_CLOUD_CPP_ENABLE_CLOG` can be used to manage output to the console."],["While `GOOGLE_CLOUD_PROJECT` is used in examples and integration tests to set the GCP project, it does not affect the library's behavior."]]],[]]
