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diff --git a/v2/src/content/en/slide/rollouts.slides b/v2/src/content/en/slide/rollouts.slides new file mode 100644 index 0000000..aed745e --- /dev/null +++ b/v2/src/content/en/slide/rollouts.slides @@ -0,0 +1,208 @@ +--- +# Rollout, feature flag, experiment, operational toggle + +@Different use cases for backend, frontend and mobile + +--- +... +# "Feature flags" tend to come up when talking about continuous deployment + +--- +.... +@CI: continuous integration +. +@CD: continuous delivery +. +@CD: continuous deployment + +--- +## Types +... +1. rollout +2. feature flag +3. experiment +4. operational toggle + +% {favicon.svg} +--- +## Rollout + +# For *rolling out* a new version of software + +Short-lived using percentages + +% FIXME: links +- a new deployment of kubernetes +- new APK released to the Play Store + +--- +## Feature flag + +# For turning a feature *on* or *off* + +Medium-lived using allow list, A/B test, percentage, app version, etc. + +- :new-chargeback-flow +- :new-debit-card-activation-screen + +--- +## Experiment + +# For analysing behaviour + +Medium-lived using allow list and A/B test + +- :debit-withdrawal-test + +--- +## Operational toggle + +# For disabling features in #crash-like situations + +Long-lived using percentage + +- :bank-barcode-payment +- :savings-bank-barcode-query-provider + +--- +.. +@We know know about the types +# But they have different relevance for backend, frontend and mobile + +--- +## backend +.. +1. rollout: k8s blue/green, canary and ~common-rollout~ common-xp +2. feature flag: ~common-rollout~ common-xp and datasets +3. experiment: common-xp +4. operational toggle: ~common-rollout~ common-xp + +--- +## frontend +.. +1. rollout: CDN and page refreshes +2. feature flag: percentages and maybe IPs (no :customer/id on the website) +3. experiment: via dynamic backend control +4. operational toggle: via dynamic backend control + +--- +## backend +.. +1. rollout: app stores +2. feature flag: via dynamic backend control +3. experiment: via dynamic backend control +4. operational toggle: via dynamic backend control + +--- +.. +@Key differentiator is +# how much *control* we have over the environment + +--- +## backend +# full control +% FIXME: emoji +% 🎉 + +--- +## frontend +# partial control +We choose when to make a new version available + +--- +## mobile +# very limited control +- app stores can restrict updates (worse for iOS) +- customers still have to download new versions + +--- +# Costs +- more complex code +- compatibility with old app versions +- nesting is exponential + +--- +# Benefits +- dynamicity + +--- +## weighting costs × benefits +# The less control we have, the more we value dynamicity + +--- +## weighting costs × benefits +... +- backend: sometimes worth the cost +- frontend: almost always worth the cost +- mobile: *always* worth the cost + +--- +... +# Best practices + +--- +# dynamic content > feature flag +Always true for mobile, almost always for frontend + +--- +# Use :include-list for named groups +Always true for backend, frontend and mobile + + {:rules + #{{:types :include-list + :content {:filename "debit-team-members.txt"}}}} + +--- +# Always use :app-version +Only for mobile + + {:rules + #{{:types :app-version + :content {:min-version #{{:platform :android + :code 1000000} + {:platform :ios + :code 2000000}}}}}} + +--- +# Extend ~common-rollout~ common-xp if required + +That's how :include-list, :app-version, etc. were born + +--- +# Beware of many nested feature flags +True for backend, frontend and mobile + +--- +# Don't delete app-facing feature flags +True for mobile + +--- +... +# Include a feature flag on the whiteboarding phase + +--- +... +# Include deleting/retiring the feature flag at the end + +--- +# Avoid renaming a feature flag +Use :app-version with :min-version instead + +--- +... +# And most importantly... + +--- +# *Always* rely on a feature flag on the app +Never do a hotfix, avoid expedited releases at all costs + +--- +## References +. +% FIXME: links +1. "Feature Toggles (aka Feature Flags)", by Pete Hodgson +2. "Continuous integration vs. delivery vs. deployment", by Sten Pittet +3. Accelerate, by N. Forsgren, J. Humble and G. Kim +4. these slides: euandre.org/slide/ +5. prose version of this presentation +6. view source |