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_TRACE_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "cloudtrace.googleapis.com") used by MakeTraceServiceConnection().
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 2025-03-14 UTC."],[[["This document provides reference information for configuring the behavior of the library using environment variables, including tracing and logging settings, and it includes a list of different versions of this library."],["The latest version of the library available is version 2.37.0-rc, and there are a multitude of previous versions available, starting at 2.11.0."],["`GOOGLE_CLOUD_CPP_TRACE_SERVICE_ENDPOINT` can be used to override the default endpoint for the `MakeTraceServiceConnection()` function, allowing for customization of where the service connects to."],["Logging can be enabled and customized using variables like `GOOGLE_CLOUD_CPP_ENABLE_TRACING`, `GOOGLE_CLOUD_CPP_TRACING_OPTIONS`, and `GOOGLE_CLOUD_CPP_ENABLE_CLOG`, where the first enables tracing for gRPC calls, the second modifies gRPC tracing behavior, and the third turns on logging in the library."],["The environment variable `GOOGLE_CLOUD_PROJECT` can be used to set the GCP project for examples and integration tests, but this variable does not affect the library's functions directly."]]],[]]
