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headermargin moveto + titlefont setfont + 0.5 0.5 0.9 setrgbcolor + center show + leftmargin ypos moveto +} def + +/n { + mainfont setfont + 0 0 0 setrgbcolor + { pagewidth leftmargin 2 mul sub } + { mainfonth l show } + linewrap +} def + +/cn { + codefont setfont + 0 0 0 setrgbcolor + { pagewidth leftmargin 2 mul sub } + { codefonth l show } + linewrap +} def + +/tn { + tinyfont setfont + 0 0 0 setrgbcolor + { pagewidth leftmargin 2 mul sub } + { tinyfonth l show } + linewrap +} def + +/is { + /level1 save def + /showpage {} def +} def + +/ie { + level1 restore +} def + +/bs { + /tbtop ypos def +} def + +/be { + /tm tbtop pad sub def + /bm ypos pad sub def + newpath + leftmargin 10 sub tm moveto + rightmargin tm lineto + rightmargin bm lineto + leftmargin 10 sub bm lineto + closepath + 0 0 0 setrgbcolor + 0.5 setlinewidth + stroke +} def +showpage +%%Page: 1 1 +s +( Rollout, feature flag, experiment, operational toggle) title +(Different use cases for backend, frontend and mobile ) authortwo +showpage +%%Page: 2 2 +s +() n +() n +() n +( "Feature flags" tend to come up when talking about continuous deployment) title +showpage +%%Page: 3 3 +s +() n +() n +() n +() n +(CI: continuous integration) authortwo +() n +(CD: continuous delivery) authortwo +() n +(CD: continuous deployment) authortwo +showpage +%%Page: 4 4 +s +( Types) header +() n +() n +() n +(1. rollout) n +(2. feature flag) n +(3. experiment) n +(4. operational toggle) n +showpage +%%Page: 5 5 +s +( Rollout) header +( For *rolling out* a new version of software) title +(Short-lived using percentages) n +(- a new deployment of kubernetes) n +(- new APK released to the Play Store) n +showpage +%%Page: 6 6 +s +( Feature flag) header +( For turning a feature *on* or *off* ) title +(Medium-lived using allow list, A/B test, percentage, app version, etc.) n +(- :new-chargeback-flow) n +(- :new-debit-card-activation-screen) n +showpage +%%Page: 7 7 +s +( Experiment) header +( For analysing behaviour) title +(Medium-lived using allow list and A/B test) n +(- :debit-withdrawal-test) n +showpage +%%Page: 8 8 +s +( Operational toggle) header +( For disabling features in #crash-like situations) title +(Long-lived using percentage) n +(- :bank-barcode-payment) n +(- :savings-bank-barcode-query-provider) n +showpage +%%Page: 9 9 +s +() n +() n +(We know know about the types) authortwo +( But they have different relevance for backend, frontend and mobile) title +showpage +%%Page: 10 10 +s +( backend) header +() n +() n +(1. rollout: k8s blue/green, canary and ~common-rollout~ common-xp) n +(2. feature flag: ~common-rollout~ common-xp and datasets) n +(3. experiment: common-xp) n +(4. operational toggle: ~common-rollout~ common-xp ) n +showpage +%%Page: 11 11 +s +( frontend) header +() n +() n +(1. rollout: CDN and page refreshes) n +(2. feature flag: percentages and maybe IPs \(no :customer/id on the website\)) n +(3. experiment: via dynamic backend control) n +(4. operational toggle: via dynamic backend control ) n +showpage +%%Page: 12 12 +s +( backend) header +() n +() n +(1. rollout: app stores) n +(2. feature flag: via dynamic backend control) n +(3. experiment: via dynamic backend control) n +(4. operational toggle: via dynamic backend control ) n +showpage +%%Page: 13 13 +s +() n +() n +(Key differentiator is) authortwo +( how much *control* we have over the environment) title +showpage +%%Page: 14 14 +s +( backend) header +( full control) title +showpage +%%Page: 15 15 +s +( frontend) header +( partial control) title +(We choose when to make a new version available ) n +showpage +%%Page: 16 16 +s +( mobile) header +( very limited control) title +(- app stores can restrict updates \(worse for iOS\)) n +(- customers still have to download new versions ) n +showpage +%%Page: 17 17 +s +( Costs) title +(- more complex code) n +(- compatibility with old app versions) n +(- nesting is exponential) n +showpage +%%Page: 18 18 +s +( Benefits) title +(- dynamicity) n +showpage +%%Page: 19 19 +s +( weighting costs × benefits) header +( The less control we have, the more we value dynamicity ) title +showpage +%%Page: 20 20 +s +( weighting costs × benefits) header +() n +() n +() n +(- backend: sometimes worth the cost) n +(- frontend: almost always worth the cost) n +(- mobile: *always* worth the cost) n +showpage +%%Page: 21 21 +s +() n +() n +() n +( Best practices) title +showpage +%%Page: 22 22 +s +( dynamic content > feature flag) title +(Always true for mobile, almost always for frontend ) n +showpage +%%Page: 23 23 +s +( Use :include-list for named groups ) title +(Always true for backend, frontend and mobile ) n +bs +({:rules) cn +( #{{:types :include-list) cn +( :content {:filename "debit-team-members.txt"}}}}) cn +be +showpage +%%Page: 24 24 +s +( Always use :app-version) title +(Only for mobile) n +bs +({:rules) cn +( #{{:types :app-version) cn +( :content {:min-version #{{:platform :android) cn +( :code 1000000}) cn +( {:platform :ios) cn +( :code 2000000}}}}}}) cn +be +showpage +%%Page: 25 25 +s +( Extend ~common-rollout~ common-xp if required) title +(That's how :include-list, :app-version, etc. were born) n +showpage +%%Page: 26 26 +s +( Beware of many nested feature flags) title +(True for backend, frontend and mobile) n +showpage +%%Page: 27 27 +s +( Don't delete app-facing feature flags) title +(True for mobile) n +showpage +%%Page: 28 28 +s +() n +() n +() n +( Include a feature flag on the whiteboarding phase) title +showpage +%%Page: 29 29 +s +() n +() n +() n +( Include deleting/retiring the feature flag at the end) title +showpage +%%Page: 30 30 +s +( Avoid renaming a feature flag) title +(Use :app-version with :min-version instead) n +showpage +%%Page: 31 31 +s +() n +() n +() n +( And most importantly...) title +showpage +%%Page: 32 32 +s +( *Always* rely on a feature flag on the app) title +(Never do a hotfix, avoid expedited releases at all costs) n +showpage +%%Page: 33 33 +s +( References) header +() n +(1. "Feature Toggles \(aka Feature Flags\)", by Pete Hodgson) n +(2. "Continuous integration vs. delivery vs. deployment", by Sten Pittet) n +(3. Accelerate, by N. Forsgren, J. Humble and G. Kim) n +(4. these slides: euandre.org/slide/) n +(5. prose version of this presentation) n +(6. view source) n + +showpage + +%%EOF |