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::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."],[[["The latest release candidate version for the recommender is 2.37.0-rc, which is accessible via a provided link, alongside a list of previous versions from 2.36.0 down to 2.11.0."],["Environment variables such as `GOOGLE_CLOUD_CPP_RECOMMENDER_ENDPOINT` can be used to override default settings like the recommender endpoint for troubleshooting purposes."],["Logging and tracing for gRPC calls can be enabled using `GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc` and `GOOGLE_CLOUD_CPP_ENABLE_CLOG=yes`, allowing for detailed observation of requests and responses."],["`GOOGLE_CLOUD_CPP_TRACING_OPTIONS` allows further customization of gRPC tracing behaviors, including the formatting of log messages, and truncation of string/bytes."],["Setting the default GCP project can be done with the variable `GOOGLE_CLOUD_PROJECT`, however, this only has an effect on examples and tests, not in the library itself."]]],[]]
