Perflib often exposes duplicate IIS entries, suffixed with '#' and a
number (I.E. iis_site_name#1).
These duplicate entries were causing the exporter to fail scraping due
to duplicate metrics.
Based on user feedback, the entry with the highest suffix
value is kept, with other duplicate entries discarded.
E.G. Given the following list of site names, "Site_B" would be
discarded, and "Site_B#2" would be kept and presented as "Site_B" in the
collector metrics.
[ "Site_A", "Site_B", "Site_C", "Site_B#2" ]
Signed-off-by: Ben Reedy <breed808@breed808.com>
Collector builder functions are only used internally in the `collector`
package, and shouldn't needlessly be exposed as part of the package API
to downstream clients.
Signed-off-by: Ben Reedy <breed808@breed808.com>
Benchmarks will allow for easier identification of slow collectors.
Additionally, they increase test coverage of the collectors, with some
collectors now reaching 80-95% coverage with this change.
Collector benchmarks have been structed so that common functionality is
present in `collector/collector_test.go` as is done with non-test
functionality in `collector/collector.go`.
Test logic that is specific to individual collectors is present in the
collector test file (E.G. `collector/process_test.go` for the Process
collector).
Signed-off-by: Ben Reedy <breed808@breed808.com>
