Uptime is the total uptime of a host over the entire lifespan.
+-----+------------------------------------+-----------------------------+ | Pos | Kernel | Uptime | +-----+------------------------------------+-----------------------------+ | 1. | Linux 3.2.0-4-amd64 | 3 years, 5 months, 23 days | | 2. | Linux 3.10.0-1160.15.2.el7.x86_64 | 1 years, 12 months, 15 days | | 3. | Linux 3.10.0-957.21.3.el7.x86_64 | 1 years, 7 months, 13 days | +-----+------------------------------------+-----------------------------+