---
meta:
  cell:
    instances: 21
  elasticsearch_master:
    disk_size: 768000

---
meta:
  cell:
    instances: 24
  elasticsearch_master:
    disk_size: 768000

Increase prod cells from 21 to 24
Increase prod cells from 21 to 24

As suggested by:

    ➜  paas-cf git:(bugfix/149962332-increase_prod_cells) ✗ make prod show-cf-memory-usage
    …
    Memory reserved by orgs: 906240 MB (885 GB)
    Memory reserved by apps: 308836 MB (301.6 GB)

    Total cell memory required to meet ADR017: 679680 MB (663.8 GB)

cells use r4.xlarge which have 30G RAM, so this gives us:

    ➜  paas-cf git:(bugfix/149962332-increase_prod_cells) ✗ bc -q
    21 * 30
    630
    24 * 30
    720

We increase by three each time so that they are balance across 3 AZs.
