How to monitor internet connectivity / downtimes

What is actually the recommended way to identify internet downtimes on OpenWrt?

ping some trusted IP on internet ?

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If you use LuCI, you can install luci-app-statistics and collectd-mod-ping, this will add a statistics option, and you can set what IPs to ping and it will plot charts with different time durations between 2 hours and 1 year by default.

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And, if you want do do something when the connection fails, look at the "watchcat" package.

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Thank you @usefive !

I installed and configured everything. Now I need to wait some days or weeks...