pipeline: inputs: podman-metrics: Add threading info

Signed-off-by: Alexa Kreizinger <alexakreizinger@gmail.com>

Author: alexakreizinger

pipeline/inputs/podman-metrics.md

@@ -13,6 +13,7 @@ description: The Podman Metrics input plugin allows you to collect metrics from
 | path.config       | Custom path to podman containers configuration file        | /var/lib/containers/storage/overlay-containers/containers.json |
 | path.sysfs        | Custom path to sysfs subsystem directory                   | /sys/fs/cgroup                                                 |
 | path.procfs       | Custom path to proc subsystem directory                    | /proc                                                          |
+| threaded | Indicates whether to run this input in its own [thread](../../administration/multithreading.md#inputs). | false |
 
 ## Getting Started