mongodb_exporter: error: unknown flag --config.file

This error indicates that the flag "--config.file" is not recognized by the "mongodb_exporter" command.

Possible solutions include:
- Check the version of the "mongodb_exporter" command you are using to ensure that it supports the "--config.file" flag.
- Verify that the flag is spelled correctly and that there are no typos or extra spaces.
- Check the documentation or help file for the "mongodb_exporter" command to see if there is a different flag or syntax that should be used to specify a configuration file.