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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
If it's something like a new reply to an issue raised, then you can either have it so these only show when the page reloads. Depending on how critical these notifications are, probably not the best solution. An alternative is to have a page that never stops loading. I've never actually used this approach, but I remember this guy used the approach for a JS-free chat system: https://github.com/kkuchta/css-only-chat
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