gRPC calls stall whenever one request retransmits. Explain head-of-line blocking in HTTP/2 and what you actually tune.

Multiplexing removes application-level queuing and hands the problem to TCP. Here is where the blocking really lives, the loss math behind it, and the four levers that help.

Grounded in researched DevOps, SRE and platform engineering interview loops, written to a senior-engineer editorial bar, and never padded to hit a word count.