You can write a main message, visible to everybody in dashboard widget. You can also write a bunch of messages in different dashboard widget, visible for all users with rights.
Admin can read and write all the messages and setup user roles, who can read and write custom messages.
Upload custom-dashboard-messages folder to the /wp-content/plugins/ directory
Can i write more main messages?
In default no, because it´s saved in web options, so that´s why there is just one message.
Client can see a running log of services performed on the dashboard when they login. Reassures them that the website IS monitored and maintained without bothersome emails that get scattered over time. For this purpose I do not use the title field to give a more condensed look. Yes, such log could be maintained on a private page but that requires client to seek it out. This is a more gentle yet persistent way of keeping them informed (for clients who DO occasionally login to the dashboard). On my personal website I also post reminders-to-self about ideas to keep on the front burner, and critical renewal dates relevant to that site. Could wish for a few tweaking options but simple and effective as-is.
Much appreciation for this plugin. More will use it once they know about it. Please keep it qualified for the repository! Thank you!