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vigil
🚦 Microservices Status Page. Monitors a distributed infrastructure and sends alerts (Slack, SMS, etc.). (by valeriansaliou)
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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.
Just did a write up on Cachet (code) -- would love to know what other people are using
I find that today it still has the best combination of features for open source stuff -- there are other alternatives like Vigil which are good but too basic, and then there's stuff that's even less featureful.
Can't beat code that is maintained though personally I'm waiting for Postgres support
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