Looks like a top notch implementation that's had some serious effort put into it for solving their unique pain points around deploys and monitoring. My colleagues and I at Raygun (https://raygun.io) have created an error tracking service that from an overview ticks the boxes that Haystack supports, and a whole bunch more besides for dev teams who don't happen to be GitHub :)
Tools like these become pretty invaluable when releasing code into the wild, and aside from lifecycle benefits like greatly reducing the cost of the maintenance phase, an error tracker can also alert and hand the data needed to fix the bug right to the person who can, greatly increasing dev sanity (no more relying on support ticket ping pong, and removes the onus on the end user to report the bug). Also, surfacing the attack vectors and the frequency of which adversaries attack code exposed to the web is rather eye opening.
Tools like these become pretty invaluable when releasing code into the wild, and aside from lifecycle benefits like greatly reducing the cost of the maintenance phase, an error tracker can also alert and hand the data needed to fix the bug right to the person who can, greatly increasing dev sanity (no more relying on support ticket ping pong, and removes the onus on the end user to report the bug). Also, surfacing the attack vectors and the frequency of which adversaries attack code exposed to the web is rather eye opening.