Based on the knowledge sources provided, there are a few approaches to handling metrics for different operating systems in GrowthBook, but creating a separate metric for each OS is not necessarily the suggested way. Here are some relevant options: 1. Using advanced mode query tool: You can create a single metric with conditions for different OS versions using the advanced mode query tool. This allows you to combine multiple conditions into one rule. [Forum Conversation > T > 33917](https://linen.growthbook.io/t/33917/hey-guys-what-is-the-recommended-approach-for-target-conditi) provides an example of how to structure such a query. 2. Separate rules with the same tracking key: You can create separate rules for different OS versions but use the same tracking key for both. This approach allows you to funnel the data into a single A/B test. 3. Using dimensions: Instead of creating separate metrics, you can use dimensions to break down your results by OS. This allows you to compare different groups of users against each other within a single metric. [Forum Conversation > T > 33912](https://linen.growthbook.io/t/33912/hey-guys-how-can-i-see-the-effect-on-an-experiment-on-a-metr) mentions that dimensions can be selected from a drop-down directly on the results page. 4. Creating a new attribute: Another suggestion is to create a new attribute that combines both the OS and version information. This can simplify your rules and queries. The most appropriate method may depend on your specific use case and data structure. If you're frequently making rules that need both OS and version information, combining them into a single attribute might be the most efficient approach.