I've been getting this error since yesterday:

```
# zypper refresh
Retrieving repository 'Main Update Repository' metadata .................................................................................................................................................................................[error]
Repository 'Main Update Repository' is invalid.
[download.opensuse.org-tumbleweed|http://download.opensuse.org/update/tumbleweed/] Valid metadata not found at specified URL
History:
 - Download (curl) error for 'http://download.opensuse.org/update/tumbleweed/repodata/8e366efd44f261f94fc57804ce60b2ed5ba9868d1f66040f2552428ffa0c37e4-primary.xml.gz':
Error code: Connection failed
Error message: Could not resolve host: mirror.tspu.ru

 - Can't provide ./repodata/8e366efd44f261f94fc57804ce60b2ed5ba9868d1f66040f2552428ffa0c37e4-primary.xml.gz

Please check if the URIs defined for this repository are pointing to a valid repository.
Skipping repository 'Main Update Repository' because of the above error.
```

'mirror.tspu.ru' is getting selected every time (from West Coast US) and it does not seem to resolve reliably anymore.  Cloudflare doesn't resolve the address at all, Google fails to resolve around 50% of the time:

```
# dig mirror.tspu.ru A @1.1.1.1

; <<>> DiG 9.16.11 <<>> mirror.tspu.ru A @1.1.1.1
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 7634
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
; EDE: 6 (DNSSEC Bogus)
;; QUESTION SECTION:
;mirror.tspu.ru.                        IN      A

;; Query time: 904 msec
;; SERVER: 1.1.1.1#53(1.1.1.1)
;; WHEN: Tue Mar 23 12:08:57 PDT 2021
;; MSG SIZE  rcvd: 49

# dig mirror.tspu.ru A @8.8.8.8

; <<>> DiG 9.16.11 <<>> mirror.tspu.ru A @8.8.8.8
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 32401
;; flags: qr rd ra ad; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;mirror.tspu.ru.                        IN      A

;; ANSWER SECTION:
mirror.tspu.ru.         21518   IN      A       193.106.132.11

;; Query time: 16 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Tue Mar 23 12:15:48 PDT 2021
;; MSG SIZE  rcvd: 59

# dig mirror.tspu.ru A @8.8.8.8

; <<>> DiG 9.16.11 <<>> mirror.tspu.ru A @8.8.8.8
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 22887
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;mirror.tspu.ru.                        IN      A

;; Query time: 436 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Tue Mar 23 12:15:28 PDT 2021
;; MSG SIZE  rcvd: 43
```

It seems like the URL is now 'mirror.tsp.edu.ru':

```
# dig mirror.tspu.edu.ru A @1.1.1.1

; <<>> DiG 9.16.11 <<>> mirror.tspu.edu.ru A @1.1.1.1
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 38265
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
;; QUESTION SECTION:
;mirror.tspu.edu.ru.            IN      A

;; ANSWER SECTION:
mirror.tspu.edu.ru.     85056   IN      A       193.106.132.11

;; Query time: 8 msec
;; SERVER: 1.1.1.1#53(1.1.1.1)
;; WHEN: Tue Mar 23 12:09:23 PDT 2021
;; MSG SIZE  rcvd: 63
```