get_droplet_cpu_metrics response format

based on https://docs.digitalocean.com/products/droplets/how-to/track-performance/#retrieve-performance-data-via-api I’m using get_droplet_cpu_metrics from python. I see the response has data like

[1759276800, ‘2341741.67’] [1759277016, ‘2341821.27’] [1759277232, ‘2341982.4699999997’] [1759277448, ‘2342070.5’] [1759277664, ‘2342244.26’] [1759277880, ‘2342407.7800000003’] [1759278096, ‘2342589.83’] [1759278312, ‘2342787.4400000004’] [1759278528, ‘2342873.01’] [1759278744, ‘2343055.73’] [1759278960, ‘2343297.16’] [1759279176, ‘2343484.9299999997’] [1759279392, ‘2343662.73’] [1759279608, ‘2343761.48’] [1759279824, ‘2343958.73’] [1759280040, ‘2344179.69’] [1759280256, ‘2344215.2199999997’] [1759280472, ‘2344323.87’] [1759280688, ‘2344429.52’] [1759280904, ‘2344636.58’]

the first value looks like an epoch time

What is the second value?