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 2025-04-02 UTC."],[[["This document outlines the various versions of the logging environment for the C++ library, with version 2.37.0-rc being the latest release candidate."],["The logging library's behavior can be configured via environment variables, offering a convenient way to troubleshoot problems without code modification."],["Endpoint overrides can be specified for different services like `ConfigServiceV2`, `LoggingServiceV2`, and `MetricsServiceV2` using their respective environment variables, allowing for custom service endpoints."],["Enabling tracing and logging for gRPC calls is possible through `GOOGLE_CLOUD_CPP_ENABLE_TRACING` and `GOOGLE_CLOUD_CPP_ENABLE_CLOG` environment variables, with further customization for tracing behavior available via `GOOGLE_CLOUD_CPP_TRACING_OPTIONS`."],["`GOOGLE_CLOUD_PROJECT` is solely used in examples and tests to set the GCP project and does not directly impact the library's functionality."]]],[]]
