Define use cases

#### public: exchanges (robots)
> The user is a developer who wants to set up an integration to receive an alert.
- [ ] most important feature: well designed and managed elasticsearch database, with good plug-and-play query examples
- [ ] alerting integrations/event api so devs can hook up to webhooks or other status endpoints

#### us: internal team dev
> An ELK instance just for our team, for use as a development AND monitoring tool.
- [ ] exemplify working infrastructure-as-code, handling deployment to a cloud service (DO, GCP, AWS...)
- [ ] development ground for exploring and developing best practices for elasticsearch indexing and queries
- [ ] nice exemplary charting

#### public: community
> Nice charting for information-rich and explorable exposition of network and client behavior trends and current status.
- [ ] nice exemplary charting

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