Blackhole Sink

The Vector blackhole sink streams log and metric events to a blackhole that simply discards data, designed for testing and benchmarking purposes.


type = "blackhole" # required
inputs = ["my-source-or-transform-id"] # required
print_amount = 1000 # required
  • uintcommonrequired


    The number of events that must be received in order to print a summary of activity.

    • No default
    • View examples

How It Works

Environment Variables

Environment variables are supported through all of Vector's configuration. Simply add ${MY_ENV_VAR} in your Vector configuration file and the variable will be replaced before being evaluated.

You can learn more in the Environment Variables section.

Health Checks

Health checks ensure that the downstream service is accessible and ready to accept data. This check is performed upon sink initialization. If the health check fails an error will be logged and Vector will proceed to start.

Require Health Checks

If you'd like to exit immediately upon a health check failure, you can pass the --require-healthy flag:

vector --config /etc/vector/vector.toml --require-healthy

Disable Health Checks

If you'd like to disable health checks for this sink you can set the healthcheck option to false.


The blackhole sink streams data on a real-time event-by-event basis. It does not batch data.