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+---
+# 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