How can I make link action

AP.flag.create({}) receives the actions prop with events. On layout it is {actionName}. How can I change href to make ability to open link in new tab or change tag to button to remove the open in new tab action from context menu?

I don’t know if it fully answers your question but this snippet should allow opening new tab to external page:

var flag = AP.flag.create({
  title: 'Successfully created a flag.',
  body: 'This is a flag.',
  type: 'success',
  actions: {
    'actionkey': 'Click me'
});'flag.action', function(event){
    if (event.actionIdentifier === ("actionkey")) {'', '_blank');

if you need to open the page relative to your Jira url then you could use this API: Navigator
Also there is some discussion about similar topic here: Show AP.flag with dynamic URL in action
Feel free to contact me if you have more questions.

Now I use this way. But I don’t like that the action context menu has the open in new tab item. If user click it, he/she will not see an effect of the action. I think it must be a button, but not anchor