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* fn: runner status and docker load images Introducing a function run for pure runner Status calls. Previously, Status gRPC calls returned active inflight request counts with the purpose of a simple health checker. However this is not sufficient since it does not show if agent or docker is healthy. With this change, if pure runner is configured with a status image, that image is executed through docker. The call uses zero memory/cpu/tmpsize settings to ensure resource tracker does not block it. However, operators might not always have a docker repository accessible/available for status image. Or operators might not want the status to go over the network. To allow such cases, and in general possibly caching docker images, added a new environment variable FN_DOCKER_LOAD_FILE. If this is set, fn-agent during startup will load these images that were previously saved with 'docker save' into docker.
Fn Documentation
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