Add a logstream for perf platform collectors
Add a logstream for perf platform collectors

The collectors log to their own file, as this was the easiest way to
setup logging. It is useful to search for collector errors in kibana, to
do this we need a logstream setup.

alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet