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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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vigil
🚦 Microservices Status Page. Monitors a distributed infrastructure and sends alerts (Slack, SMS, etc.). (by valeriansaliou)
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vigil-local
🕯 Vigil Local daemon. Used as a slave service to monitor hosts behind a firewall and report their status to Vigil.
You could probably also do something like that with https://github.com/huginn/huginn.
Personally, I use have Prometheus with Blackbox exporter to create metrics for sites I need to monitor. Grafana then uses Prometheus as a data source, so I can monitor the data. I've also set up email alerts in Grafana.