go-sqlmock's Rows.AddRow() takes values which have a type alias of
"any", and appear to default to untyped ints if not explicitly cast.
When large values are passed which would overflow int32, tests fail.
Signed-off-by: Daniel Swarbrick <daniel.swarbrick@gmail.com>
The intent is to use the instance struct to hold the connection to the database as well as metadata about the instance. Currently this metadata only includes the version of postgres for the instance which can be used in the collectors to decide what query to run. In the future this could hold more metadata but for now it keeps the Collector interface arguments to a reasonable number.
Signed-off-by: Joe Adams <github@joeadams.io>
