Time to live exceeded
The Time to live (TTL) field in the IPv4 header has a misleading name. Every router that forwards an IP packet decreases the value of the field by one — it actually has nothing to do with time at all. In the IPv6 header this field is called “hop limit”. If the TTL value hits 0, an ICMP message “time to live exceeded” is sent to the dispatcher of the packet. Meanwhile, some network components drop packets with TTL equal to zero silently. This mechanism is useful for preventing packets from becoming caught up in an endless routing loop within your network. The observant reader and network veteran is familiar with this technique because traceroute uses it to identify all hops that a packet makes on its route to its destination.

https://www.dynatrace.com/news/blog/detecting-network-errors-impact-on-services/