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Zabbix
Real-time monitoring of IT components and services, such as networks, servers, VMs, applications and the cloud.
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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.
rsyslog -> promtail -> loki -> grafana also but tbh, i don't really need to use it much (https://github.com/grafana/loki)
NOTE:
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Hence, a higher number means a more popular project.