On 2016-04-14 for ~6 hours I see the following error in cif-router logs.
[2016-04-14T11:12:42,355Z][31846][ERROR]: MapperParsingException[failed to parse [peers.date]]; nested: MapperParsingException[failed to parse date field [NA], tried both date format [dateOptionalTime], and timestamp number with locale []]; nested: IllegalArgumentException[Invalid format: "NA"];
...
[2016-04-14T17:41:34,912Z][31846][ERROR]: MapperParsingException[failed to parse [peers.date]]; nested: MapperParsingException[failed to parse date field [NA], tried both date format [dateOptionalTime], and timestamp number with locale []]; nested: IllegalArgumentException[Invalid format: "NA"];
On 2016-04-14 for ~6 hours I see the following error in cif-router logs.