Add a notification center about nodejs-pool

[Snipa22]

Unless you're sending in excess of 10,000 e-mails a month, Mailgun is free. I don't see an issue with adding extended e-mail setups down the line (And might even be interesting/useful), as we already have miner disconnect states.

[Josexv1]

About the usage of resources, it's just a plus for pool owners, as users sometimes, you want to have the notifications in the pool site instead of receiving multiple emails, it may be helpful to have more notifications, just like the hashrate alarm

[Snipa22]

It would be an increase in resource usage by the pool site as it would now need to track the additional state information, which, at the moment, is completely transient. Not impossible to add, just not particularly easy offhand either, if it's something fairly well wanted, I'll be glad to add it to a todo list for when I have some time to burn on the project again.

[Josexv1]

Thanks, i just thought that it would be a simple database record, just like the trigger used to send an email, just record it and shows in a panel if there's anything new.

[Snipa22]

All of the current e-mail triggers are derived live from inbound content as the worker processes it, versus storing it in DB.