Comment 1 for bug 1871307

Fixed by upstream commit:

commit cd09fd82522861830aaf9d237b26eef5f9ba50d2
Author: Bart Van Assche <email address hidden>
Date: Wed Nov 21 20:47:42 2018 -0800

    MIB-II: Only log once that opening /proc/net/if_inet6 failed

    If IPv6 has been disabled (ipv6.disable=1) then opening /proc/net/if_inet6
    fails. Only log this once instead of thousand of times a day.

    Reported-by: Fif <email address hidden>

diff --git a/agent/mibgroup/ip-mib/data_access/ipaddress_linux.c b/agent/mibgroup/ip-mib/data_access/ipaddress_linux.c
index 5ddead3e0..280575ce3 100644
--- a/agent/mibgroup/ip-mib/data_access/ipaddress_linux.c
+++ b/agent/mibgroup/ip-mib/data_access/ipaddress_linux.c
@@ -234,7 +234,7 @@ _load_v6(netsnmp_container *container, int idx_offset)

 #define PROCFILE "/proc/net/if_inet6"
     if (!(in = fopen(PROCFILE, "r"))) {
- snmp_log_perror("ipaddress_linux: could not open " PROCFILE);
+ NETSNMP_LOGONCE((LOG_ERR, "ipaddress_linux: could not open " PROCFILE));
         return -2;
     }