Page Speed flags browser caching of Google Analytics. The following is a way to address this.

I have seen this documented somewhere else, this is my implementation.

Html

Replace:

https://www.google-analytics.com/analytics.js

with

https://johnvincent.io/analytics.js

Nginx configuration

server {
    listen 443 ssl http2;
    listen [::]:443 ssl http2;

.......

    location = /analytics.js {
        proxy_pass https://www.google-analytics.com;
        expires 31536000s;
        proxy_set_header Pragma "public";
        proxy_set_header Cache-Control "max-age=31536000, public";
    }

Restart Nginx

sudo nginx -t
sudo systemctl reload nginx
sudo systemctl restart nginx