chore: add keepalive time and keepalive timeout for grpc external processor #23
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Adding capabilities to configure keepalive_time and keepalive_timeout for grpc external post-processor.
Linux by default has a mechanism to detect less-clean failure (half-open connection) with net.ipv4.tcp_retries2. This has a default value of 15. Only when that number is reached, the OS will forcefully terminate the “half-open” connection and force the connection to be recreated.
keepalive_time and keepalive_timeout helps early identify half-open connection.