Kafka certificates in PEM format

[nabokihms]

Just wanted to share.

I've added the feature to specify Kafka certificates in PEM format in line with other providers.
#15448

However, there is a bug in rdkafka library that only reads a single certificate for CA, not the whole chain.
confluentinc/librdkafka@f8830a2

For now, we fixed it by building vector with librdkafka >= 2.0
https://github.com/deckhouse/deckhouse/blob/7a4e2dd5af28cd444a94029d1f51392a7d5e3147/modules/460-log-shipper/images/vector/Dockerfile

[jszwedko]

Thanks for sharing @nabokihms ! It looks like there is a PR bumping the rdkafka-sys to 2.0.2 of librdkafka so hopefully we can easily pull these changes into Vector soon. fede1024/rust-rdkafka#553

[IngeborgRupprechtX]

Thank you for sharing!