The file index.php, which is being maintained in a git repository, was changed locally and contains an error. If the error has not been committed to the repository yet, which of the following git commands reverts the local copy of index.php to the latest committed version in the current branch?

Which section of the Prometheus configuration defines which nodes are monitored?

If a Dockerfile references the container's base image without a specific version tag, which tag of that image is used to create the container?

Which of the following statement describes the principal concept behind test driven development?

A recently installed application writes log data to /opt/app/log/info.log. If Filebeat is already installed and set up for communication with a remote Logstash, what has to be done in order to submit the log data of the new application to Logstash?