Final answer:
Tagged hosts can usually be added to dashboards manually through dashboard settings, but some platforms also allow it via an API or third-party integration tools.
Step-by-step explanation:
To add tagged hosts to dashboards, it can typically be done manually from the dashboard settings of most modern monitoring and dashboarding platforms. However, certain platforms may allow this action to be done via their API, enabling automated host addition, or through third-party integration tools that have been configured to interact with the platform. It's less common to add tagged hosts using specific command-line instructions, but this method might be used in certain contexts or with certain types of dashboarding software.