pipeline: outputs: azure_blob: add log_key to outputs

Signed-off-by: Thomas Wilk <[email protected]>

Author: Thomas Wilk

pipeline/outputs/azure_blob.md

@@ -24,6 +24,7 @@ Fluent Bit exposes the following configuration properties.
 | `sas_token`                  | Specify the Azure Storage shared access signatures to authenticate against the service. This configuration property is mandatory when `auth_type` is `sas`.                                                                  | _none_                        |
 | `container_name`             | Name of the container that will contain the blobs.                                                                                                                                                                           | _none_                        |
 | `blob_type`                  | Specify the desired blob type. Supported values: `appendblob`, `blockblob`.                                                                                                                                                  | `appendblob`                  |
+| `log_key`                    | By default, the entire log record is sent to blob storage. If you specify a key name with this option, only the value of that key is sent.                                                                                   | _none_                        |
 | `auto_create_container`      | If `container_name` doesn't exist in the remote service, enabling this option handles the exception and auto-creates the container.                                                                                          | `on`                          |
 | `path`                       | Optional. The path to store your blobs. If your blob name is `myblob`, specify subdirectories for storage using `path`. For example, setting `path` to `/logs/kubernetes` will store your blob in `/logs/kubernetes/myblob`. | _none_                        |
 | `compress`                   | Sets payload compression in network transfer. Supported value: `gzip`                                                                                                                                                        | _none_                        |