What's this read indicator in PMs?

AI-generated summary

hello-smile6 asked about a read indicator appearing randomly in private messages, noting it seems to be part of Discourse core. simon explained that this indicator is specific to group PMs and appears only when the group’s “On group messages publish group read state” setting is enabled. Simon noted that this configuration is found at the group level rather than as a site setting, which often causes confusion. hello-smile6 appreciated the clarification but suggested that a tooltip or other explanation would be helpful for users encountering the indicator.

I’ve only ever seen this on a few seemingly random PMs, what is this? As far as I can tell, it seems to be part of Discourse core.

The read indicator is only shown on a group’s PMs. It will be displayed to group members if the group’s “On group messages publish group read state” setting is enabled:

I’ve been stumped looking for this setting a few times. I always expect it to show up as a site setting, not as a group setting. Configuring it on the group level makes sense though.

Thank you! That makes sense, I wish there was something (e.g. a tooltip) that explained it where a user would see it.