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feat: implement prometheus plugin
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Signed-off-by: Harry Bagdi <[email protected]>
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160 changes: 160 additions & 0 deletions README.md
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# Kong Prometheus Plugin

# DOCUMENT STATE: WORK IN PROGRESS

This plugin exposes metrics in [Prometheus Exposition format](https://github.com/prometheus/docs/blob/master/content/docs/instrumenting/exposition_formats.md).


### Available metrics
- *Status codes*: HTTP status codes returned by upstream services.
These are available per service and across all services.
- *Latencies Histograms*: Latency as measured at Kong:
- *Request*: Total request latency
- *Kong*: Time taken for Kong to route, authenticate and run all plugins for a request
- *Upstream*: Time taken by the upstream to respond to the request.
- *Bandwidth*: Total Bandwidth (egress/ingress) flowing through Kong.
This metrics is availble per service and across all services.
- *DB reachability*: Can the Kong node reach it's Database or not (Guage 0/1).
- *Connections*: Various NGINX connection metrics like active, reading, writing,
accepted connections.


### Using the plugin

#### TODO add installation steps if not bundled with CE/EE

#### Enable the plugin
```bash
$ curl http://localhost:8001/plugins name=prometheus
```

#### Put metrics into Prometheus
Metrics are availble on the admin API at `/metrics` endpoint:
```bash
$ curl http://localhost:8001/metrics
root@vagrant-ubuntu-trusty-64:~# curl -D - http://localhost:8001/metrics
HTTP/1.1 200 OK
Server: openresty/1.11.2.5
Date: Mon, 11 Jun 2018 01:39:38 GMT
Content-Type: text/plain; charset=UTF-8
Transfer-Encoding: chunked
Connection: keep-alive
Access-Control-Allow-Origin: *

# HELP kong_bandwidth_total Total bandwidth in bytes for all proxied requests in Kong
# TYPE kong_bandwidth_total counter
kong_bandwidth_total{type="egress"} 1277
kong_bandwidth_total{type="ingress"} 254
# HELP kong_bandwidth Total bandwidth in bytes consumed per service in Kong
# TYPE kong_bandwidth counter
kong_bandwidth{type="egress",service="google"} 1277
kong_bandwidth{type="ingress",service="google"} 254
# HELP kong_datastore_reachable Datastore reachable from Kong, 0 is unreachable
# TYPE kong_datastore_reachable gauge
kong_datastore_reachable 1
# HELP kong_http_status_total HTTP status codes aggreggated across all services in Kong
# TYPE kong_http_status_total counter
kong_http_status_total{code="301"} 2
# HELP kong_http_status HTTP status codes per service in Kong
# TYPE kong_http_status counter
kong_http_status{code="301",service="google"} 2
# HELP kong_latency Latency added by Kong, total request time and upstream latency for each service in Kong
# TYPE kong_latency histogram
kong_latency_bucket{type="kong",service="google",le="00001.0"} 1
kong_latency_bucket{type="kong",service="google",le="00002.0"} 1
.
.
.
kong_latency_bucket{type="kong",service="google",le="+Inf"} 2
kong_latency_bucket{type="request",service="google",le="00300.0"} 1
kong_latency_bucket{type="request",service="google",le="00400.0"} 1
.
.
kong_latency_bucket{type="request",service="google",le="+Inf"} 2
kong_latency_bucket{type="upstream",service="google",le="00300.0"} 2
kong_latency_bucket{type="upstream",service="google",le="00400.0"} 2
.
.
kong_latency_bucket{type="upstream",service="google",le="+Inf"} 2
kong_latency_count{type="kong",service="google"} 2
kong_latency_count{type="request",service="google"} 2
kong_latency_count{type="upstream",service="google"} 2
kong_latency_sum{type="kong",service="google"} 2145
kong_latency_sum{type="request",service="google"} 2672
kong_latency_sum{type="upstream",service="google"} 527
# HELP kong_latency_total Latency added by Kong, total request time and upstream latency aggreggated across all services in Kong
# TYPE kong_latency_total histogram
kong_latency_total_bucket{type="kong",le="00001.0"} 1
kong_latency_total_bucket{type="kong",le="00002.0"} 1
.
.
kong_latency_total_bucket{type="kong",le="+Inf"} 2
kong_latency_total_bucket{type="request",le="00300.0"} 1
kong_latency_total_bucket{type="request",le="00400.0"} 1
.
.
kong_latency_total_bucket{type="request",le="+Inf"} 2
kong_latency_total_bucket{type="upstream",le="00300.0"} 2
kong_latency_total_bucket{type="upstream",le="00400.0"} 2
.
.
.
kong_latency_total_bucket{type="upstream",le="+Inf"} 2
kong_latency_total_count{type="kong"} 2
kong_latency_total_count{type="request"} 2
kong_latency_total_count{type="upstream"} 2
kong_latency_total_sum{type="kong"} 2145
kong_latency_total_sum{type="request"} 2672
kong_latency_total_sum{type="upstream"} 527
# HELP kong_nginx_http_current_connections Number of HTTP connections
# TYPE kong_nginx_http_current_connections gauge
kong_nginx_http_current_connections{state="accepted"} 8
kong_nginx_http_current_connections{state="active"} 1
kong_nginx_http_current_connections{state="handled"} 8
kong_nginx_http_current_connections{state="reading"} 0
kong_nginx_http_current_connections{state="total"} 8
kong_nginx_http_current_connections{state="waiting"} 0
kong_nginx_http_current_connections{state="writing"} 1
# HELP kong_nginx_metric_errors_total Number of nginx-lua-prometheus errors
# TYPE kong_nginx_metric_errors_total counter
kong_nginx_metric_errors_total 0

```

In case Admin API of Kong is protected behind a firewall or requires
authentication, you've two options:

1. If your proxy nodes also serve the Admin API, then you can create a route
to `/metrics` endpoint and apply a IP restriction plugin.
```
curl -XPOST http://localhost:8001/services -d name=prometheusEndpoint -d url=http://localhost:8001/metrics
curl -XPOST http://localhost:8001/services/prometheusEndpoint/routes -d paths[]=/metrics
curl -XPOST http://localhost:8001/services/prometheusEndpoint/plugins -d name=ip-restriction -d config.whitelist=10.0.0.0/24
```

2. This plugin has the capability to serve the content on a
different port using a custom server block in Kong's NGINX template.

Please note that this requires a custom NGINX template for Kong.

You can add the following block to a custom NGINX template which can be used by Kong:
```
server {
server_name kong_prometheus_exporter;
listen 0.0.0.0:9542; # can be any other port as well
location / {
default_type text/plain;
content_by_lua_block {
local serve = require "kong.plugins.prometheus.serve"
serve.prometheus_server()
}
}
location /nginx_status {
internal;
access_log off;
stub_status;
}
}
```
29 changes: 29 additions & 0 deletions kong-prometheus-plugin-0.1.0-0.rockspec
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package = "kong-prometheus-plugin"
version = "0.1.0-0"

source = {
url = "https://github.com/Kong/kong-plugin-prometheus",
tag = "0.1.0"
}

supported_platforms = {"linux", "macosx"}
description = {
summary = "Prometheus metrics for Kong and upstreams configured in Kong",
license = "Apache 2.0",
}

dependencies = {
"kong >= 0.13.0",
}

build = {
type = "builtin",
modules = {
["kong.plugins.prometheus.api"] = "kong/plugins/prometheus/api.lua",
["kong.plugins.prometheus.exporter"] = "kong/plugins/prometheus/exporter.lua",
["kong.plugins.prometheus.handler"] = "kong/plugins/prometheus/handler.lua",
["kong.plugins.prometheus.prometheus"] = "kong/plugins/prometheus/prometheus.lua",
["kong.plugins.prometheus.serve"] = "kong/plugins/prometheus/serve.lua",
["kong.plugins.prometheus.schema"] = "kong/plugins/prometheus/schema.lua",
}
}
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