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fix(server): Add read and write timeouts
There are a few documented scenarios where `kube-state-metrics` will lock up(#995, #1028). I believe a much simpler solution to ensure `kube-state-metrics` doesn't lock up and require a restart to server `/metrics` requests is to add default read and write timeouts and to allow them to be configurable. At Grafana, we've experienced a few scenarios where `kube-state-metrics` running in larger clusters falls behind and starts getting scraped multiple times. When this occurs, `kube-state-metrics` becomes completely unresponsive and requires a reboot. This is somewhat easily reproduceable(I'll provide a script in an issue) and causes other critical workloads(KEDA, VPA) to fail in weird ways. Adds two flags: - `server-read-timeout` - `server-write-timeout` Updates the metrics http server to set the `ReadTimeout` and `WriteTimeout` to the configured values.
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