...As the data within a shard are coarsely ordered, you will get all your logs from one container in one shard roughly in order. Nested partition key is supported and you can use -> to point to your target key which is nested under another key. For example, your partition_key could be kubernetes->pod_name. If you don't set a partition key or put an invalid one, a random key will be generated, and the logs will be directed to random shards.