Is there a way to set an auto reminder of a message for a whole channel if there is no reaction or reply? e.g. there is a message with a bug report on a channel and I can set that if no one reacts there should be another message sent to the channel

Hey there @Jakub Jadanowski​! Nice username by the way 😉

It is possible to do this if you create a Slack app and call the Slack API. This is one possibility on how I could see this app working:

1. Call the `conversations.history` method to get a certain number of messages from the channel in mention: https://api.slack.com/methods/conversations.history
2. Go through the messages and check whether or not there has been a reaction. For this, you would need to use the `reactions.get` method: https://api.slack.com/methods/reactions.get
3. Lastly, use `chat.postMessage` with a permalink to any messages in #2 that have not been reacted on: https://api.slack.com/methods/chat.postMessage.

I hope that helps!