Flood Warning message : user=[iso-8859-1],db=[iso-8859-1],host= WARNING:pg_getnameinfo_all() failed: Temporary failure in name resolution - Mailing list pgsql-general

We have recently noticed in our development environment pg_log with flooded message.

[64459]: [1-1] user=[unknown],db=[unknown],host= WARNING:  pg_getnameinfo_all() failed: Temporary failure in name resolution
[64463]: [1-1] user=[unknown],db=[unknown],host= WARNING:  pg_getnameinfo_all() failed: Temporary failure in name resolution
[64464]: [1-1] user=[unknown],db=[unknown],host= WARNING:  pg_getnameinfo_all() failed: Temporary failure in name resolution
[64548]: [1-1] user=[unknown],db=[unknown],host= WARNING:  pg_getnameinfo_all() failed: Temporary failure in name resolution
[64551]: [1-1] user=[unknown],db=[unknown],host= WARNING:  pg_getnameinfo_all() failed: Temporary failure in name resolution
[64553]: [1-1] user=[unknown],db=[unknown],host= WARNING:  pg_getnameinfo_all() failed: Temporary failure in name resolution

Not sure , How to address this message ,

Much appreciated if some one give light on this.

Version . : 9.2.23

Regards,

Raj