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_CONFIG_SERVICE_V2_ENDPOINT=... overrides the EndpointOption (which defaults to "logging.googleapis.com") used by MakeConfigServiceV2Connection().
GOOGLE_CLOUD_CPP_LOGGING_SERVICE_V2_ENDPOINT=... overrides the EndpointOption (which defaults to "logging.googleapis.com") used by MakeLoggingServiceV2Connection().
GOOGLE_CLOUD_CPP_METRICS_SERVICE_V2_ENDPOINT=... overrides the EndpointOption (which defaults to "logging.googleapis.com") used by MakeMetricsServiceV2Connection().
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 page provides documentation for configuring the behavior of the C++ logging library using environment variables, with versioned links ranging from 2.11.0 up to the latest release candidate, 2.37.0-rc."],["Several environment variables, such as `GOOGLE_CLOUD_CPP_CONFIG_SERVICE_V2_ENDPOINT`, `GOOGLE_CLOUD_CPP_LOGGING_SERVICE_V2_ENDPOINT`, and `GOOGLE_CLOUD_CPP_METRICS_SERVICE_V2_ENDPOINT`, allow for overriding default endpoint settings used by various service connection functions."],["The `GOOGLE_CLOUD_CPP_ENABLE_TRACING` and `GOOGLE_CLOUD_CPP_TRACING_OPTIONS` variables are used to enable and customize gRPC tracing, allowing for the examination of requests and responses and enabling the use of multiple lines for tracing messages."],["Enabling logging output is possible by using `GOOGLE_CLOUD_CPP_ENABLE_CLOG`, so that the infrastructure will print the logging messages to the console or using a specified logging backend."],["While `GOOGLE_CLOUD_PROJECT` can be set, it is only used in the library's examples and tests, having no direct impact on the library itself."]]],[]]
