Add a higher threshold alarm which we can use for known checkout failure reasons

[tjmw]

What are you doing in this PR?

This PR adds a new higher threshold alarm/metric.

Trello Card

Why are you doing this?

In #6745 we stopped alarming on the "email already taken" error from identity. It's a known issue and we don't want to spend time investigating every time it happens. However, we would like to know if it starts occurring at a higher volume. This PR adds the concept of a higher threshold alarm/metric which we can use to cover this case. The alarm will trigger if 10 or more minutes in the last hour have errors.

How to test

Forcing the "email already taken" error locally I see the following in the logs:

pushing higher threshold alarm metric for 500 Some(email_address_already_taken)

I could also see the new metric in Cloudwatch:

How can we measure success?

Have we considered potential risks?

Accessibility test checklist

• Tested with screen reader
• Navigable with keyboard
• Colour contrast passed
• The change doesn't use only colour to convey meaning

Screenshots

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From guardian/actions-riff-raff.

[github-actions]

Size Change: 0 B

Total Size: 1.89 MB

ℹ️ View Unchanged

Filename	Size
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./public/compiled-assets/javascripts/[countryGroupId]/router.js	93.4 kB
./public/compiled-assets/javascripts/ausMomentMap.js	108 kB
./public/compiled-assets/javascripts/contributionsRedirectStyles.js	20 B
./public/compiled-assets/javascripts/digitalSubscriptionLandingPage.js	222 kB
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./public/compiled-assets/javascripts/paperSubscriptionCheckoutPage.js	163 kB
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./public/compiled-assets/javascripts/promotionTerms.js	73.5 kB
./public/compiled-assets/javascripts/subscriptionsLandingPage.js	72.9 kB
./public/compiled-assets/javascripts/subscriptionsRedemptionPage.js	118 kB
./public/compiled-assets/javascripts/unsupportedBrowserStyles.js	20 B
./public/compiled-assets/javascripts/weeklySubscriptionCheckoutPage.js	160 kB
./public/compiled-assets/javascripts/weeklySubscriptionLandingPage.js	88.1 kB
./public/compiled-assets/webpack/114.js	12.2 kB
./public/compiled-assets/webpack/127.js	3.53 kB
./public/compiled-assets/webpack/136.js	2.17 kB
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./public/compiled-assets/webpack/192.js	5.69 kB
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./public/compiled-assets/webpack/847.js	26 kB
./public/compiled-assets/webpack/969.js	37.8 kB
./public/compiled-assets/webpack/checkout.js	17 kB
./public/compiled-assets/webpack/GuardianAdLiteLanding.js	8.27 kB
./public/compiled-assets/webpack/LandingPage.js	15.5 kB
./public/compiled-assets/webpack/oneTimeCheckout.js	6.07 kB
./public/compiled-assets/webpack/ThankYou.js	44.4 kB

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[github-actions]

Deploy build 22417 of support:support-workers-mono to CODE

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From guardian/actions-riff-raff.

[andrewHEguardian]

Nice! 👍

[prout-bot]

Seen on PROD (merged by @tjmw 8 minutes and 52 seconds ago)

• Keep an eye out for the post deployment Playwright smoke tests github action
• If the tests have failed, the post deployment test runbook should help troubleshoot.

Sentry Release: support-client-side, support