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_RECOMMENDER_ENDPOINT=... overrides the EndpointOption (which defaults to "recommender.googleapis.com") used by MakeRecommenderConnection().
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 2025-03-05 UTC."],[[["This document provides reference information for the Recommender C++ library, detailing various available versions and configuration options."],["The latest version of the Recommender library is 2.37.0-rc, while the document includes links to versions ranging from 2.11.0 up to 2.37.0-rc."],["Environment variables such as `GOOGLE_CLOUD_CPP_RECOMMENDER_ENDPOINT` can be used to customize the library's behavior, like overriding the default endpoint."],["Logging and tracing can be enabled using environment variables like `GOOGLE_CLOUD_CPP_ENABLE_TRACING` and `GOOGLE_CLOUD_CPP_ENABLE_CLOG`, which help in debugging and monitoring gRPC calls."],["The document also mentions that `GOOGLE_CLOUD_PROJECT` can be used in tests and examples, but does not directly affect the library's behavior."]]],[]]
