TeamSite Discussion.md

Questions for TeamSite sync up on 09/26/2018

Whitelisting

Whitelisted pages:

['/', '/disability', '/facilities', '/welcome-kit']

Goal

Store a whitelist (an array of strings):

• in a place that is accessible to both the FE and BE
• does not require the FE to repeatedly make a call to the BE to retrieve the list

Whitelisting Implementation Ideas

1. Maintaining two individual flat files on both BE/FE

   • Have to maintain same content in two places
   • FE & BE both whitelist

2. Only the FE maintains the list

   • Single source of truth for whitelist
   • Only the FE does the whitelisting
   • Exposes BE endpoint to DoS attacks

3. Adding to DevOps config as environment var for both FE and BE

   • Single source of truth for whitelist
   • Would not require a network request by either
   • FE & BE both whitelist

Sampling

Goal

We want to avoid recording metrics for every pageload on whitelisted paths.

Implementation Ideas

• Do the FE eng have suggestions for how best to throttle & sample?

  • Current method is to randomly sample a given percentage of users

• Will we desire varying densities/settings per environment?

  • I.e. va.gov to have 10% but preview.va.gov to have 100%

Additional concerns

• Which environments SHOULD have metrics enabled?
  • Just in preview.va.gov & ultimately va.gov?
  • Is there a use case for staging or dev?