November 2023 Summaries

In an article by Jaanus Sellin dated November 7, 2023, the role of hashing, specifically Murmur hashing, in the Unleash platform's feature flagging system is explored, highlighting its significance in executing gradual rollouts of new features. The Unleash team uses Murmur hashing to consistently determine which subset of users sees a new feature, ensuring a stable user experience across devices. However, they encountered a discrepancy where user distribution across feature flag variants did not align with expected percentages during partial rollouts. This was traced back to using the same seed for two hashing operations, which introduced bias and skewed distribution. The solution involved using distinct seeds for separate hashing operations, which resolved the issue but required an update across all SDKs, potentially disrupting user experience temporarily. Despite these challenges, the team is confident that the revised approach enhances the system's integrity and user experience.

Unleash 5.6 introduces several enhancements focusing on user management and ecosystem integrations, including the ability to assign multiple roles to users and groups, and an export script for improved visibility into user access. The release also improves integrations with tools like Terraform and Datadog, with the Terraform Provider reaching version 1.0, adding functionalities such as resource importation and enhanced logging, while Datadog integration now supports JSON formatting for easier data parsing. A notable contribution from Jonas Strømsodd allows the configuration of initial admin user credentials via environment variables, enhancing flexibility. Additionally, user invitations have been streamlined, making it easier to invite others to Unleash instances.