Remove Dwellir Tunisia endpoints (down since Jan 2026)

[rockbmb]

Summary

All *-tn.dwellir.com (Dwellir Tunisia) endpoints have been unreachable for 3+ months, confirmed by continuous nightly CI failures since #12112 (Jan 14, 2026) through the latest #12225 (Apr 2, 2026).

Direct connectivity tests against all 11 endpoints today confirmed they are completely down (connection refused/timeout), while the non-Tunisia Dwellir endpoints (*.n.dwellir.com) remain healthy.

Changes

Removed Dwellir Tunisia provider entries from:

File	Endpoints removed
productionRelayPolkadot.ts	Polkadot relay, Asset Hub, Bridge Hub, Collectives (4)
productionRelayKusama.ts	Kusama relay, Asset Hub, Bridge Hub (3)
testingRelayWestend.ts	Westend relay, Asset Hub, Bridge Hub, Collectives (4)

Related

• Closes Unavailable chain endpoints Thu, Apr 2 2026, 5:05:02 am #12225
• Related Unavailable chain endpoints Wed, Jan 14 2026, 4:11:44 am #12112, Unavailable chain endpoints Fri, Feb 6 2026, 4:37:18 am #12153, Unavailable chain endpoints Tue, Feb 10 2026, 5:00:38 am #12159, Unavailable chain endpoints Thu, Feb 12 2026, 4:57:26 am #12162, Unavailable chain endpoints Sun, Feb 22 2026, 4:37:38 am #12176

[rockbmb]

DNS evidence — all Tunisia endpoints return zero A records

$ for host in polkadot-rpc-tn.dwellir.com kusama-rpc-tn.dwellir.com westend-rpc-tn.dwellir.com \
  statemint-rpc-tn.dwellir.com statemine-rpc-tn.dwellir.com westmint-rpc-tn.dwellir.com \
  polkadot-bridge-hub-rpc-tn.dwellir.com kusama-bridge-hub-rpc-tn.dwellir.com \
  westend-bridge-hub-rpc-tn.dwellir.com polkadot-collectives-rpc-tn.dwellir.com \
  westend-collectives-rpc-tn.dwellir.com; do echo "--- $host ---"; dig +noall +answer +question "$host"; echo ""; done

--- polkadot-rpc-tn.dwellir.com ---
;polkadot-rpc-tn.dwellir.com.	IN	A
(no records)

--- kusama-rpc-tn.dwellir.com ---
;kusama-rpc-tn.dwellir.com.	IN	A
(no records)

--- westend-rpc-tn.dwellir.com ---
;westend-rpc-tn.dwellir.com.	IN	A
(no records)

--- statemint-rpc-tn.dwellir.com ---
;statemint-rpc-tn.dwellir.com.	IN	A
(no records)

--- statemine-rpc-tn.dwellir.com ---
;statemine-rpc-tn.dwellir.com.	IN	A
(no records)

--- westmint-rpc-tn.dwellir.com ---
;westmint-rpc-tn.dwellir.com.	IN	A
(no records)

--- polkadot-bridge-hub-rpc-tn.dwellir.com ---
;polkadot-bridge-hub-rpc-tn.dwellir.com. IN A
(no records)

--- kusama-bridge-hub-rpc-tn.dwellir.com ---
;kusama-bridge-hub-rpc-tn.dwellir.com. IN A
(no records)

--- westend-bridge-hub-rpc-tn.dwellir.com ---
;westend-bridge-hub-rpc-tn.dwellir.com. IN A
(no records)

--- polkadot-collectives-rpc-tn.dwellir.com ---
;polkadot-collectives-rpc-tn.dwellir.com. IN A
(no records)

--- westend-collectives-rpc-tn.dwellir.com ---
;westend-collectives-rpc-tn.dwellir.com.	IN A
(no records)

All 11 *-tn.dwellir.com hostnames return zero A records — DNS has been deprovisioned entirely. This is not a transient outage; the Tunisia cluster infrastructure has been decommissioned.

For comparison, the non-Tunisia Dwellir endpoints resolve and respond normally:

$ dig +short polkadot-rpc.n.dwellir.com
[resolves correctly]

$ curl -s -X POST https://polkadot-rpc.n.dwellir.com -H "Content-Type: application/json" -d '{"id":1,"jsonrpc":"2.0","method":"system_health","params":[]}'
{"jsonrpc":"2.0","id":1,"result":{"peers":16,"isSyncing":false,"shouldHavePeers":true}}