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_API_KEYS_ENDPOINT=... overrides the EndpointOption (which defaults to "apikeys.googleapis.com") used by MakeApiKeysConnection().
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 2025-04-01 UTC."],[[["This document provides a detailed overview of various versions for API keys, ranging from version 2.11.0 up to the latest release candidate 2.37.0-rc, with links to the respective documentation pages for each version."],["Environment variables such as `GOOGLE_CLOUD_CPP_API_KEYS_ENDPOINT` can be used to override default endpoint settings for `MakeApiKeysConnection()`, providing flexibility in configuring the library's behavior."],["Tracing and logging features can be enabled via environment variables like `GOOGLE_CLOUD_CPP_ENABLE_TRACING` and `GOOGLE_CLOUD_CPP_ENABLE_CLOG`, allowing for detailed monitoring of gRPC calls and general library logging, respectively."],["The `GOOGLE_CLOUD_CPP_TRACING_OPTIONS` variable can be set to modify the behavior of gRPC tracing, impacting how messages are formatted and whether fields are truncated."],["`GOOGLE_CLOUD_PROJECT` can be set to manage the project within the examples and tests, but it won't affect the library itself."]]],[]]
