Document kapacitor_alert and kapacitor_cluster measurements (#7278)

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# Kapacitor Plugin # Kapacitor Plugin
The Kapacitor plugin will collect metrics from the given Kapacitor instances. The Kapacitor plugin collects metrics from the given Kapacitor instances.
### Configuration: ### Configuration:
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# insecure_skip_verify = false # insecure_skip_verify = false
``` ```
### Measurements & Fields ### Measurements and fields
- [kapacitor](#kapacitor) - [kapacitor](#kapacitor)
- [num_enabled_tasks](#num_enabled_tasks) _(integer)_ - [num_enabled_tasks](#num_enabled_tasks) _(integer)_
- [num_subscriptions](#num_subscriptions) _(integer)_ - [num_subscriptions](#num_subscriptions) _(integer)_
- [num_tasks](#num_tasks) _(integer)_ - [num_tasks](#num_tasks) _(integer)_
- [kapacitor_alert](#kapacitor_alert)
- [notification_dropped](#notification_dropped) _(integer)_
- [primary-handle-count](#primary-handle-count) _(integer)_
- [secondary-handle-count](#secondary-handle-count) _(integer)_
- (Kapacitor Enterprise only) [kapacitor_cluster](#kapacitor_cluster) _(integer)_
- [dropped_member_events](#dropped_member_events) _(integer)_
- [dropped_user_events](#dropped_user_events) _(integer)_
- [query_handler_errors](#query_handler_errors) _(integer)_
- [kapacitor_edges](#kapacitor_edges) - [kapacitor_edges](#kapacitor_edges)
- [collected](#collected) _(integer)_ - [collected](#collected) _(integer)_
- [emitted](#emitted) _(integer)_ - [emitted](#emitted) _(integer)_
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--- ---
### kapacitor_alert
The `kapacitor_alert` measurement stores fields with information related to
[Kapacitor alerts](https://docs.influxdata.com/kapacitor/v1.5/working/alerts/).
#### notification-dropped
The number of internal notifications dropped because they arrive too late from another Kapacitor node.
If this count is increasing, Kapacitor Enterprise nodes aren't able to communicate fast enough
to keep up with the volume of alerts.
#### primary-handle-count
The number of times this node handled an alert as the primary. This count should increase under normal conditions.
#### secondary-handle-count
The number of times this node handled an alert as the secondary. An increase in this counter indicates that the primary is failing to handle alerts in a timely manner.
---
### kapacitor_cluster
The `kapacitor_cluster` measurement reflects the ability of [Kapacitor nodes to communicate](https://docs.influxdata.com/enterprise_kapacitor/v1.5/administration/configuration/#cluster-communications) with one another. Specifically, these metrics track the gossip communication between the Kapacitor nodes.
#### dropped_member_events
The number of gossip member events that were dropped.
#### dropped_user_events
The number of gossip user events that were dropped.
---
### kapacitor_edges ### kapacitor_edges
The `kapacitor_edges` measurement stores fields with information related to The `kapacitor_edges` measurement stores fields with information related to
[edges](https://docs.influxdata.com/kapacitor/latest/tick/introduction/#pipelines) [edges](https://docs.influxdata.com/kapacitor/latest/tick/introduction/#pipelines)