I always check the health of a cryptocurrency by looking at its hash rate distribution.
Where can I see that information for Monero?
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https://monerohash.com/#network is a pretty good visualisation of the state of Monero mining. It also has some basic stats on nodes, and the blocks the monerohash pool has found.
preview.moneropools.com has a pie chart showing the hashrate distribution of almost every public pool, including the unknown hashrate estimated from the network difficulty.