Multiple redirects for GA tracking

[c2g]

We recently replaced a high traffic online service with a new one that now resides at a new URL. We redirect the old site (https://subdomain.mysite.org) to a static page announcing the change (http://www.mysite.org/announcement.html) that links out to the new online service.

The SSL cert on the old site is valid for two more months and then would cost $1K to renew. We'd like to measure traffic from the old link over the next two months to see if it's worth renewing the SSL cert to keep a redirect going.

If I go into GA, filter the "announcement.html" page and set the secondary dimension to "referral path" I'm not seeing any traffic from https://subdomain.mysite.org. Guessing this is part of the "(not set)" group. First thought was to have that go to a unique intermediary page to log the referral, which then redirects out to the announcement page. Is this considered spammy or is there another way to track referrals from the https site that I'm not considering?

Thanks.

[ThriveIdeas]

Why not add utm parameters (Google URL Builder tool) to the redirect URL? These will get passed over to the new domain and you can then take a look at the Acquisition > Campaigns > All Campaigns report in Google Analytics.

[c2g]

I may have answered my own question. Since the redirecting https site is a subdomain, it would show up under "/" for the referral path, correct? There are no links to the new page from the actual home page, so I'm thinking "/" is what I'd need to track for the redirect.