New lock type: "Official Announcement Lock"
139084
Add the ability to lock a question against edits
23326
New Post Notices are live network-wide
110606
Can we get a comments only lock?
27503
Is there a better alternative than this to 'switch on type'?
116318
Don't display "protected" notice if the question is locked or closed
152519
The notification tray at the top of Stack Exchange sites: what is it called? And are there other good examples of this?
52227
Privilege Notifications
71750
Companion affinity change notification
60953
How could we formalize the introduction of new notation?
45215
Can we get notification in the tab (change of title)?
56562
Can we have an option to disable notifications on community wiki posts?
44211
Duplicate notification for the same reputation event after editing question title
97532
How to submit a new method of encryption?
47370
How do you choose when to show the "Please avoid extended discussions in comments" notice?
29561
Show election voting privilege notice next to its button
127190
How to implement the deprecated methods of Notification
29273
What is a "locked" post?