Looking at RSS User-Agents
An RSS reader sends periodic requests to get the latest feed. This includes a User-Agent field, identifying which fetcher is running:
Feedbin feed-id:1242010 - 38 subscribers
This fetcher is nicely passing along statistics, saying how many readers it represents.
I took one day of logs, with 5,962 requests for my RSS feed:
$ sudo grep '"GET /news.rss ' \
/var/log/nginx/access.log.1 \
| awk -F'"' '{print $6}' \
| wc -l
5962
There were 162 unique User-Agents:
$ sudo grep '"GET /news.rss ' \
/var/log/nginx/access.log.1 \
| awk -F'"' '{print $6}' \
| sort \
| uniq \
| wc -l
162
Of the 5,962 requests, 932 (16%) gave stats:
$ sudo grep '"GET /news.rss ' \
/var/log/nginx/access.log.1 \
| awk -F'"' '{print $6}' \
| grep 'subscriber\|reader' \
| wc -l
932
They sent 21 distinct User-Agents:
$ sudo grep '"GET /news.rss ' \
/var/log/nginx/access.log.1 \
| awk -F'"' '{print $6}' \
| grep 'subscriber\|reader' \
| sort \
| uniq \
| wc -l
21
Some sent multiple requests with different numbers of subscribers:
Feedbin feed-id:1242010 - 38 subscribers
Feedbin feed-id:372940 - 11 subscribers
Feedbin feed-id:382 - 1 subscribers
I suspect this comes from people using old URLs that then get redirected to my current URL. For example, now it's https://www.jefftk.com/news.rss, but it used to be http://www.jefftk.com/news.rss, and even longer ago it was an sccs.swarthmore.edu address. Summing subscriber counts, I see:
Feedly: 573
inoreader.com: 87
NewsBlur: 62
Feedbin: 50
theoldreader.com: 34
Dreamwidth Studios: 7
BazQux: 5
Bloglovin: 2
Feed Wrangler: 2
pine.blog: 1
While this only tells us about users who are subscribed to my blog, it seems like Feedly is the biggest player here by a lot.
Different services fetched at different intervals. Taking the shortest interval for each distinct User-Agent:
Feedly: 7min
Feedbin: 15min
Bloglovin: 30min
Dreamwidth Studios: 30min
Feed Wrangler: 30min
NewsBlur: 30min
BazQux: 40min
inoreader.com: 1hr
theoldreader.com: 2hr
pine.blog: 24hr
Looking through the requests that don't list subscribers, several do seem to be services. I'll try reaching out to them to see if they're interested in adding subscriber counts to their User-Agents.