constant traffic to self

New to PiHole and examining the query logs, the server is pinging itself constantly -- is this normal behavior?

2019-11-30 00:48:23 AAAA server localhost OK (cached) NODATA Blacklist
2019-11-30 00:48:23 A server localhost OK (cached) NXDOMAIN Blacklist
2019-11-30 00:48:22 AAAA server localhost OK (cached) NODATA Blacklist
2019-11-30 00:48:22 A server localhost OK (cached) NXDOMAIN Blacklist
2019-11-30 00:48:22 AAAA server localhost OK (cached) NODATA (0.1ms) Blacklist
2019-11-30 00:48:22 A server localhost OK (cached) NXDOMAIN (0.1ms) Blacklist
2019-11-30 00:48:21 AAAA server localhost OK (cached) NODATA (0.1ms) Blacklist
2019-11-30 00:48:21 A server localhost OK (cached) NXDOMAIN Blacklist
2019-11-30 00:48:20 AAAA server localhost OK (cached) NODATA Blacklist
2019-11-30 00:48:20 A server localhost OK (cached) NXDOMAIN (0.1ms) Blacklist

The device localhost (the host platform for Pi-Hole or Pi-Hole itself) is asking for the domain named "server", not necessarily pinging itself.

Is there a device on your network named "server"?

the PiHole device is server

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