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As you can see from this chart (screenshot taken from this webpage), the mempool has been increasing in size very rapily for the past ~9 hours, filling up with extremely low-fee transactions of between 0 and 5 satoshis per byte.
The chart shows the cumulative size of the mempool over the last 24 hours, broken into different fee levels. The lowest fee level, 0-5 satoshis/byte, is shown in light blue at the bottom and has been growing steadily and rapidly for hours and hours.
The black line overlaying the chart is the total fee of all transactions in the mempool. Although the total fee did rise initially, it seems to be coming back down, which shows that the vast majority of the transactions are either 0-fee or very low-fee.
Is this an attack on the network?