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observability: add container monitoring in docker-compose / pure docker deployments

Warren Gifford requested to merge sg/container-monitoring into master

Created by: slimsag

This adds container monitoring for restarts (e.g. due to OOM), and for high CPU / memory usage. Warning alerts will fire when restarts occur, or CPU/memory usage is at 90%.

This only applies to Docker Compose / Pure Docker deployments for now. In 3.16 I will explore making these same cadvisor metrics available in Kubernetes deployments.

How it looks

On instances WITHOUT cadvisor (kubernetes, server, dev), it looks like this and the alerts will never fire:

image

On instances WITH cadvisor (docker-compose, pure docker), it looks like this and the alerts will fire (warning only for now):

image

Helps https://github.com/sourcegraph/sourcegraph/issues/9791 Helps https://github.com/sourcegraph/sourcegraph/issues/9793

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