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• in clickhouse instance: Table doesn’t have any table TTL expression, cannot remove.

This is harmless.

• in otel agent: Err: connection error: desc = “transport: Error while dialing: dial tcp 10.254.210.2294317 connect: connection refused”

This looks like a n/w issue.

Any tips to debug the connection refused error?

were you able to send data from your application? Or Is nothing working for you?

nothing work except logs. hotrod sample application seems to not send any data but the troubleshooting container doesn't show any error https://signoz.io/docs/install/troubleshooting/#kubernetes