Q.eucalyptus leaves falling in summer
It is June and a large 30-year-old, 45-50 feet tall eucalyptus tree leaves are falling in mountains. The leaves have brown spots, and are like brown to white tiny bumps. They stain the concrete or the pool floor. Is this normal?

Here are a couple of links.
There are a few disease issues that have been occurring with the Eucalyptus Tree.
You may want to have the tree examined by a profession Arborist.
https://www.gardeningknowhow.com/ornamental/trees/eucalyptus/eucalyptus-tree-problems.htm
https://www.gardeningknowhow.com/ornamental/trees/eucalyptus/tips-growing-eucalyptus.htm