You should give a try to http://hnwatcher.com, it's an alerting tool based on the HN Search API. I personally follow the "algolia" keyword -> it helped me get your question mentioning "hn.algolia.com". Enjoy ;)
Thanks! I'll try hnwatcher.com for now. I emailed the creators because I didn't get a confirmation email yet, but it looks like what I was looking for.
