Diagnosis Storage & Duplicate Error Detection

[osw282]

• Some sort of check to make sure the agent are just being triggered again and again for the same error
• Isolated error. It's only a single instance, so will trigger a single webhook request. There's also probably some correlation ID/trace ID in there, that we can use to deduplicate if the same error happens every once a while.
• Repeated error. Something that happens multiple times in a row repeatedly. Will trigger multiple requests. We'll need to dedup on the error itself. We'd need some sort of memory for that.