nouns - Word for someone who pays attention to details

I know I've seen a word that describes a person who has a high perception of details (for example, seeing specific information in a log file), but I can't recall it now.

Insights?

Answer

Consider punctilious, meticulous, and persnickety.

punctilious: strictly attentive to minute details.

meticulous: taking or showing extreme care about minute details.

persnickety: paying extremely close attention to details.

Also, consider "astute observer."