collectd is an open source monitoring system which can record to e.g. RRD flat files or SQLite and can forward collected metrics to SIEM-like monitoring and charting and anomaly detection apps like Grafana or InfluxDB.
Nagios has "state flaping detection" to prevent spurious notifications.
collectd-python-plugins includes Python scripts for monitoring humidity and temp with i2c sensors and Python: https://github.com/dbrgn/collectd-python-plugins
There are LoraWAN soil moisture sensors, but they require batteries or an in-field charging method
"Satellite images of plants' fluorescence can predict crop yields" (2024)
"Sensor-Free Soil Moisture Sensing Using LoRa Signals (2022)" https://dl.acm.org/doi/abs/10.1145/3534608 .. https://news.ycombinator.com/context?id=40234912
/? open source soil moisture sensor: https://www.google.com/search?q=open+source+soil+moisture+se...
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