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::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."],[[["This page provides documentation for configuring the behavior of the logging library using environment variables, including settings for various endpoints, tracing, and logging."],["The `GOOGLE_CLOUD_CPP_CONFIG_SERVICE_V2_ENDPOINT`, `GOOGLE_CLOUD_CPP_LOGGING_SERVICE_V2_ENDPOINT`, and `GOOGLE_CLOUD_CPP_METRICS_SERVICE_V2_ENDPOINT` variables can override the default endpoints for their respective services."],["Enabling gRPC call tracing can be done by setting `GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc`, and to get logs on the console you should set `GOOGLE_CLOUD_CPP_ENABLE_CLOG` as well."],["The environment variable `GOOGLE_CLOUD_CPP_TRACING_OPTIONS` can be set to modify how gRPC tracing behaves, such as changing the format of messages and how string/bytes are displayed."],["The page contains multiple versions of the documentation, from version `2.11.0` all the way up to the latest `2.37.0-rc`, with each version available through its own linked page."]]],[]]
