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Environment variables

You can use environment variables to control the run-time behavior of Grafana Alloy.

The following environment variables are supported:

  • GODEBUG
  • HTTP_PROXY
  • PPROF_MUTEX_PROFILING_PERCENT
  • PPROF_BLOCK_PROFILING_RATE

Refer to the Go runtime documentation for more information about Go runtime environment variables.

GODEBUG

You can use the GODEBUG environment variable to control the debugging variables within the Go runtime. The following arguments are supported.

ArgumentDescriptionDefault
x509usefallbackrootsEnforce a fallback on the X.509 trusted root certificates. Set to 1 to enable.0
netdnsForce a resolver. Set to go for a pure Go resolver. Set to cgo or win32 for a native resolver.
netdnsShow resolver debugging information. Set to 1 for basic information. Set to 2 for verbose.

HTTP_PROXY

You can use the HTTP_PROXY environment variable to define the hostname or IP address of the proxy server. For example, you can set the proxy to http://proxy.example.com.

PPROF_MUTEX_PROFILING_PERCENT

You can use the PPROF_MUTEX_PROFILING_PERCENT environment variable to define the percentage of mutex profiles to retrieve from the pprof mutex endpoint. If you set this variable to 5, then 5 percent of the mutexes are sampled. The default value is 0.01.

PPROF_BLOCK_PROFILING_RATE

You can use the PPROF_BLOCK_PROFILING_RATE environment variable to define the rate that mutexes are tracked. You can use the following values with this environment variable. The default value is 10000.

  • 0: Nothing is tracked.
  • 1: All mutexes are tracked.
  • A value greater than 1: The number of nanoseconds to track mutexes.