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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.
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Gotify
A simple server for sending and receiving messages in real-time per WebSocket. (Includes a sleek web-ui) (by gotify)
I like Apprise, one single Python library / CLI tool, to send notifications via a lot of services: https://github.com/caronc/apprise
Handy examples. If you need flexibility with regards to output channels, Apprise is undoubtedly a good choice. There are also dedicated projects such as https://ntfy.sh/ and https://gotify.net/ (both self-hostable).
If you have XMPP, you can also send notifications to XMPP directly via sendxmpp (of which there are actually many incarnations: https://wiki.xmpp.org/web/User:MDosch/Sendxmpp_incarnations ) or via a webhook/HTTP API such as https://slickmsg.com/
Handy examples. If you need flexibility with regards to output channels, Apprise is undoubtedly a good choice. There are also dedicated projects such as https://ntfy.sh/ and https://gotify.net/ (both self-hostable).
If you have XMPP, you can also send notifications to XMPP directly via sendxmpp (of which there are actually many incarnations: https://wiki.xmpp.org/web/User:MDosch/Sendxmpp_incarnations ) or via a webhook/HTTP API such as https://slickmsg.com/