Our great sponsors
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Argus
Argus is a lightweight monitor to notify of new software releases via Gotify/Slack/other messages and/or WebHooks.
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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.
Take a look at Argus. I use it to monitor the application version (not a container tag). I get notifications via mailrise (SMTP gateway for apprise) which then go to Gotify and Discord. I have webhooks setup to run scripts so I can approve the update from the Argus app to automate the update. You can also have it set to auto approve.
https://crazymax.dev/diun/ could check for new containers for you
https://github.com/renovatebot/renovate or https://github.com/dependabot if you using git for your configuration
You could try some commandline tool like skopeo to fetch the image tags regularly and do some shell magic to notify you on any change you want