Alex Dadgar bb45b95bc4 Allow tuning of heartbeat ttls ...

This PR allows tuning of heartbeat TTLs. An example of very aggressive
settings is as follows:

```
server {
  heartbeat_grace = "1s"
  min_heartbeat_ttl = "1s"
  max_heartbeats_per_second = 200.0
}
```

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..

configuration

Allow tuning of heartbeat ttls

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encryption.html.md

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index.html.md

Document permissions for agents

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telemetry.html.md

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