1) The document discusses how Docker and cloud computing allow applications to be more dynamic and take advantage of ephemeral resources.
2) It notes that in the cloud, resources can be provisioned and deprovisioned quickly, unlike traditional data centers, allowing applications to scale up and down easily.
3) Monitoring dynamic cloud environments poses unique challenges because infrastructure components like containers may have extremely short lifecycles, appearing and disappearing rapidly, requiring monitoring tools that can track ephemeral resources and their lifecycles.