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restbase: add error rates and storage latencies alerts

Description

restbase: add error rates and storage latencies alerts

similar to 5d04bd78d but only add the alerts to the graphite host, this avoid
having equal alerts that would fire at the same time for each and every
restbase host

Bug: T78514
Change-Id: I580dd8ac60d0ab1ebf0a5abd52f304f36f509754