Increase size of facia-rendering app instances

[cemms1]

What does this change?

Updates facia-rendering EC2 instances to use a T4G medium rather than a T4G small.

Why?

We've been seeing a lot of DCR Timeout exceptions on the facia-rendering app since splitting the DCR traffic. This PR aims to reduce these errors.

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From guardian/actions-riff-raff.

[github-actions]

Size Change: 0 B

Total Size: 760 kB

ℹ️ View Unchanged

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_{compressed-size-action}

[arelra]

t4g.medium increases the available memory and IO (slightly) but not the cpu count.

I believe DCR is cpu bound rather than memory but its still worth trying to assess the impact.

https://instances.vantage.sh/?filter=t4g.small|t4g.medium.&region=eu-west-1&reserved_term=yrTerm1Standard.allUpfront&compare_on=true&selected=t4g.small,t4g.medium.

[cemms1]

t4g.medium increases the available memory and IO (slightly) but not the cpu count.

I believe DCR is cpu bound rather than memory but its still worth trying to assess the impact.

Ah, thanks Ravi - that's useful to know and think about. I'm just in the process of putting together a dashboard to try to understand the impact of this change but we may well have to up the number of CPUs here.

[prout-bot]

Seen on PROD (merged by @cemms1 10 minutes and 59 seconds ago) Please check your changes!

[arelra]

@cemms1 I also remembered because DCR is a single threaded process it will only use one CPU. If we want to take advantage of more CPUs we will want to resurrect cluster mode for t4g.xlarge:

#9321
#9973
https://github.com/guardian/dotcom-rendering/blob/d5fac6372861d400ca8feca97eaf86b8fa83c4b4/dotcom-rendering/docs/architecture/029-scaling-policy-decision-record.md