scale to RAM

[maxheld83]

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[maxheld83]

to avoid this again in the future, we must load test the live app

[maxheld83]

there's not much to do here.

We ran out of RAM not b/c there any one slot took too much RAM or too many visitors did (that just triggered it, b/c we were so damn close), but because there were too many slots live at once (for testing).

As a result, we can't meaningfully "scale to RAM", b/c:

1. that may start too many instances, and not for the reason we want to
2. we'd need to make sure that the slots are sparsely distributed, otherwise we'll never have enough RAM.

The long-term solution for this lives in:

• https://github.com/subugoe/shinycaas/issues/64
• https://github.com/subugoe/shinycaas/issues/63

In the meantime, I've reduced RAM again to 3.5gigs and will keep an eye on slots (i.e. delete them when no longer used), that should do the trick.