Add link to opsmanual for check_nginx_min_requests
Add link to opsmanual for check_nginx_min_requests

See opsmanual for more info on what this check
actually does.
alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet