jq example files

count_error_severities.jq

reduce inputs as $obj (
    {};
    if $obj.severity == "E" then
      . + {
          ($obj.severity): (.[$obj.severity] + 1)
      }
    else
        .
    end
)

count_severities.jq

reduce inputs as $obj (
    {};
    . + {
        ($obj.severity): (.[$obj.severity] + 1)
    }
)

count_widget_error_severities.jq

reduce inputs as $obj (
    {};
    if ($obj.error.msg|test("widget";"i")) then
    . + {
        ($obj.severity): (.[$obj.severity] + 1)
    }
    else
        .
    end
)

error.json.log

{"ts":"2017-11-30 06:45:02","severity":"I","error":{"msg":"Reticulating splines","splines":1}}
{"ts":"2017-11-30 06:45:12","severity":"I","error":{"msg":"Probing froobles (Widget 5)","names":["frb23","frb42"]}}
{"ts":"2017-11-30 06:45:57","severity":"E","error":{"msg":"Widget exploded"}}