Hi Björn,

Thanks for reporting this.

From which version did you upgrade to 19.2.3?

Just double-checking -- did you run `ceph telemetry on` (along with
`--license sharing-1-0`) *after* the upgrade?

In the meantime, you can mute the health warning.

We're looking into the IPv6 issue — thanks for sharing your insights.

Thanks,
Yaarit

On Tue, Aug 26, 2025 at 3:58 AM Björn Lässig <[email protected]>
wrote:

> Hi,
>
> Does anyone know who to contact to report problems with
> telemetry.ceph.com?
>
> After a reasonably successful update of my cluster, I received a
> HEALTH_WARN [Telemetry requires re-opt-in]  even though I had already
> re-approved telemetry.
>
> While trying to understand the problem, I stumbled across the fact that
> although the host telemetry.ceph.com has an IPv4 and an IPv6 address, I
> cannot reach it because IPv6 only has a dropping firewall or something
> similar attached to it.
>
> Now, I can configure a proxy that also reaches the legacy Internet, but
> it also tried to reach IPv6 first, so that currently no IPv6-enabled
> Ceph cluster should be visible in the telemetry.
>
> My workaround would now be to overlay telemetry.ceph.com on the DNS
> cache... but that's just a hack.
>
> ----- raw shell output for reproduction -----
>
>  > host telemetry.ceph.com
>  telemetry.ceph.com has address 8.43.84.137
>  telemetry.ceph.com has IPv6 address 2620:52:3:3:201a:4aff:feab:8409
>
>  > telnet 2620:52:3:3:201a:4aff:feab:8409  80
>  Trying 2620:52:3:3:201a:4aff:feab:8409...
>  telnet: Unable to connect to remote host: Connection timed out
>
>  > telnet 8.43.84.137  80
>  Trying 8.43.84.137...
>  Connected to 8.43.84.137.
>  Escape character is '^]'.
>  get / HTTP/1.0
>
>  HTTP/1.1 302 Found
>  Location: https://telemetry.ceph.com/
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