Figured out why my test PDS instances weren't being crawled. Last week, when I set up Knative on that server, I changed the ingress from Traefik to Contour, but with Contour, the default is no websockets. Pretty easy to turn it back on and they are live again.
If you have a fediverse account, you can quote this note from your own instance. Search https://bsky.brid.gy/convert/ap/at://did:plc:iztv76aq7fbpxmyjwqv5vrhz/app.bsky.feed.post/3ln4gfyxjac2w on your instance and quote it. (Note that quoting is not supported in Mastodon.)