fluentd exporter: Disconnect and retry DNS lookup on socket failure #469
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On socket failure, re-initialize the address info.
Along with #468, this triggers a new DNS lookup.
To prevent immediate retries that quickly exhaust the retry count,
add a retry_delay_ms to FluentdExporterOptions, defaulting to 1000ms.
We found this useful when deploying in a Kubernetes environment,
where the targeted service endpoint may not yet be up when a logging client starts up.