Load Balancing Strategies for High Traffic Services

hey everyone, been thinking about load balancing recently, specifically for services that see a ton of traffic. we usually default to round-robin or least connections, but im wondering if there are more advanced strategies or specific scenarios where other methods really shine. what are you all using when you need to keep things super performant and available under heavy load? are there specific algorithms that handle sticky sessions better, or ones that are particularly good at dealing with uneven server performance? curious to hear your experiences and any pitfalls to watch out for.