Grafana dashboard: swagger-stats dashboard v3
Description: Swagger-Stats Main Dashboard Revision  3

# swagger-stats Main Dashboard


###  [http://swaggerstats.io](http://swaggerstats.io) | [Documentation](http://swaggerstats.io/docs.html) 

[![npm version](https://badge.fury.io/js/swagger-stats.svg)](https://badge.fury.io/js/swagger-stats)

[https://github.com/slanatech/swagger-stats](https://github.com/slanatech/swagger-stats)

**swagger-stats** traces REST API requests and responses in Node.js Microservices, and collects metrics per API Operation.
swagger-stats detects API operations based on express routes. You may also provide [Swagger (Open API) specification](https://swagger.io/specification/), 
and swagger-stats will match API requests with API Operations defined in swagger specification. 

**swagger-stats** exposes [Prometheus](https://prometheus.io/)  metrics per API Operation,  using labels like `method="GET"` and `path="/pet/{petId}"`,
so you may use [Prometheus](https://prometheus.io/) and [Grafana](https://grafana.com/) for API monitoring and alerting

This Dashboard is a summary top-level view on API Operation metrics provided by swagger-stats.

# Prometheus Queries using swagger-stats metrics

## Get Request Rate, Error Rate, Success Rate

```
sum (irate(api_request_total[1m]))
sum (irate(api_request_total{code=~"^5..$"}[1m]))
sum (irate(api_request_total{code=~"^4..$"}[1m]))
sum (irate(api_request_total{code=~"^2..$"}[1m]))

```

## Get % of errors 

```
( api_all_errors_total / api_all_request_total ) * 100
```

## Get Apdex Score

> How Apdex Score is calculated: [Apdex Score](https://en.wikipedia.org/wiki/Apdex) 

```
(
  sum(rate(api_request_duration_milliseconds_bucket{le="25",code=~"^2..$"}[1m]))
+
  sum(rate(api_request_duration_milliseconds_bucket{le="100",code=~"^2..$"}[1m]))
) / 2 / sum(irate(api_request_duration_milliseconds_count[1m]))
```

## Get Request Rate by Method

```
sum by(method) (irate(api_request_total[1m]))
``` 

## Get % of request answered within threshold, over time 

> Use `le="XX"` to set threshold, i.e. `le="25"` for % of request answered under 25 msec.
> Values of `le` should be from the list of bucket values specified in swagger-stats option `durationBuckets` 

```
( sum(irate(api_request_duration_milliseconds_bucket{le="25"}[1m])) /  sum(irate(api_request_duration_milliseconds_count[1m])) ) * 100
``` 
 
## Get Top 3 API Calls by Path, over time 

```
topk(3, sum(irate(api_request_total[1m])) by (path))
```   

## Get Top 3 5XX Errors By Path, over time 

```
topk(3, sum(irate(api_request_total{code=~"^5..$"}[1m])) by (path))
```   

## Get Node.js process CPU Usage % 

```
nodejs_process_cpu_usage_percentage
```

## Get Node.js process Used Heap in MB

```
(nodejs_process_memory_heap_used_bytes)/1048576
```


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