As an experienced developer adept in both PHP and Python, I can bring a unique perspective to your project's application development. My understanding of your requirements perfectly aligns with my skill set. I have hands-on experience with network packet capturing using Python libraries such as Scapy, which will be crucial for your app's performance for traffic analysis.
Not only can I capture packets from a specified network interface, but I also excel in analyzing the data, which is your next requirement. During my career, I've developed several data analytic tools and applications that can process and provide accurate results for metrics like total packets captured, count by protocol (TCP/UDP), top 5 source/destination IP addresses with maximum traffic, etc.
Finally, let me emphasize my special talent for documentation - I understand its paramount importance in technology implementation. As your app will need well explained guides to configure, execute and utilize effectively, you can rely on me for its thorough creation. Additionally, if you value Docker integration in this project, it'll be a pleasure to deliver that 'plus' skill to enhance the app's scalability and deployment efficiency. Let's join forces and produce a powerful application while simplifying complexities through detailed documentation!