Do not receive notifications for the thread that this status is part of. Must be a thread in which you are a participant.

statuses API methods - Mastodon documentation
https://docs.joinmastodon.org/methods/statuses/#mute

あるじゃん

pleroma独自機能だった

Has these additional fields under the pleroma object:

• thread_muted: true if the thread the post belongs to is muted

Differences in Mastodon API responses from vanilla Mastodon - Pleroma Documentation
https://docs-develop.pleroma.social/backend/development/API/differences_in_mastoapi_responses/#statuses

ないんだ

このアカウントは、notestockで公開設定になっていません。