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When using dhclient, the current lease info, including expiration time, is in /var/lib/dhclient/dhclient.leases, and contains something similar to

lease {
  interface "enp3s0";
  fixed-address [redacted];
  option subnet-mask 255.255.254.0;
  option dhcp-lease-time 3523;
  option routers [redacted];
  option dhcp-message-type 5;
  option dhcp-server-identifier 96.113.84.141;
  option domain-name-servers 127.0.0.1,75.75.75.75,75.75.76.76;
  option domain-search "[redacted]";
  option dhcp-renewal-time 2016;
  option broadcast-address 255.255.255.255;
  option dhcp-rebinding-time 3073;
  option domain-name "hsd1.or.comcast.net.";
  renew 3 2022/06/22 23:59:57;
  rebind 4 2022/06/23 00:23:15;
  expire 4 2022/06/23 00:30:45;
}

However, my system uses NetworkManager which, based on my research, uses its own internal DHCP client. Looking in /var/lib/NetworkManager I see

$ sudo ls  /var/lib/NetworkManager/
internal-79cbd87e-9d65-4aa4-8768-88b460fd372c-enp3s0.lease  NetworkManager-intern.conf  seen-bssids
internal-79cbd87e-9d65-4aa4-8768-88b460fd372c-ens1.lease    NetworkManager.state        timestamps
internal-bdaf2eb0-de2e-4573-a415-214629c7b757-enp3s0.lease  secret_key

which looks promising. However, the lease files contain only the IP address.

$ sudo cat /var/lib/NetworkManager/internal-79cbd87e-9d65-4aa4-8768-88b460fd372c-enp3s0.lease
# This is private data. Do not parse.
ADDRESS=[redacted]

Simple question: Where does NetworkManager keep the lease data so it knows when it needs to renew the lease?

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