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nats-streaming-concepts/monitoring/README.md
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@@ -71,29 +71,30 @@ Here you'll find examples demonstrating how to use Prometheus query expressions
### Pending Messages from Channel Foo
```
```text
sum(nss_chan_subs_pending_count{channel="foo"}) by (client_id)
```
<img width="1580" alt="Pending" src="https://user-images.githubusercontent.com/26195/54960400-b0c52e80-4f19-11e9-9e92-88fba89fd55e.png">
![Pending](https://user-images.githubusercontent.com/26195/54960400-b0c52e80-4f19-11e9-9e92-88fba89fd55e.png)
### Messages Per Sec Delivered on Channel Foo
In this case, `3` is the size of the quorum of NATS Streaming Server nodes. In case of a single instance backed by a relational database we would set it to `1`:
In this case, `3` is the size of the quorum of NATS Streaming Server nodes. In case of a single instance backed by a relational database we would set it to `1`:
```
```text
sum(rate(nss_chan_msgs_total{channel="foo"}[5m])) by (channel) / 3
```
<img width="1579" alt="msgs-per-sec" src="https://user-images.githubusercontent.com/26195/54960588-80ca5b00-4f1a-11e9-92d5-de59c81b6c63.png">
![msgs-per-sec](https://user-images.githubusercontent.com/26195/54960588-80ca5b00-4f1a-11e9-92d5-de59c81b6c63.png)
### Msgs/Sec vs Pending on Channel
Example of combining the rate of messages with the pending count to detect whether processing is getting behind:
```
```text
sum(rate(nss_chan_msgs_total{channel="foo"}[5m])) by (channel) / 3
sum(nss_chan_subs_pending_count{channel="foo"}) by (channel) / 3
```
<img width="1468" alt="combination" src="https://user-images.githubusercontent.com/26195/54960992-4235a000-4f1c-11e9-8e55-47515a5d944d.png">
![combination](https://user-images.githubusercontent.com/26195/54960992-4235a000-4f1c-11e9-8e55-47515a5d944d.png)