query tracing #5821
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query tracing #5821
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Introduces a new GRPC Server that supports the streaming of rich information about query traces. This server enables users to obtain stats about running queries without having to change any settings other than enabling the tracing server via the relevant env var.
This is an important step to be able to analyse query performance at runtime in order to explore potential improvements. The exported queries have enough information to then automate the analysis of query plans on postgres to derive new performance improvements, can also be used to sample queries in runtime with no need to restart the graph-node.
The design aims to introduce as little overhead as possible, the subscription are eventually consistent and use watch channels to provide updates so the hot path is lock free, the highest price is paid once when the tracing mechanism is initialised.