Add Node plugin

[ericwholt]

This will add new plugin to parse Node.js logs. Logs produced using Winston for logging. Includes kubernetes as log source option.

{
  "timestamp": "2021-08-18T20:54:18.272872-04:00",
  "severity": 30,
  "severity_text": "200",
  "labels": {
    "file_name": "node.log",
    "log_type": "node",
    "plugin_id": "node"
  },
  "record": {
    "headers": {
      "accept-encoding": "gzip",
      "host": "express:3000",
      "user-agent": "Go-http-client/1.1"
    },
    "level": "info",
    "message": "HTTP GET /members",
    "method": "GET",
    "originalUrl": "/members",
    "protocol": "http",
    "protocol_version": "1.1",
    "query": {},
    "responseTime": 2,
    "status": 200,
    "url": "/members"
  }
}

[jsirianni]

Looks good, a few comments. I still need to test on kubernetes, which I will do before approving.

CI is failing as well but not due to anything in this PR (as far as I can tell). I will be merging a fix to master and then rebase into this branch.

[jsirianni]

CI is fixed

1. Let me know when you handle my comments
2. Ill test on k8s
3. Approve and merge assuming k8s works (I suspect it does).

[jsirianni]

@ericwholt Lets rename from node --> nodejs

[jsirianni]

k8s log

{
  "timestamp": "2021-08-20T01:17:05.057422949Z",
  "severity": 30,
  "severity_text": "200",
  "labels": {
    "k8s-ns/kubernetes.io/metadata.name": "default",
    "k8s-pod/app": "express",
    "k8s-pod/pod-template-hash": "57966494d",
    "log_type": "nodejs",
    "plugin_id": "kubernetes_container",
    "stream": "stdout"
  },
  "resource": {
    "k8s.cluster.name": "",
    "k8s.container.id": "a63bf128d19a2da0d40ce73e701fb3e9e098d3f624631f63d0698bc585743fbb",
    "k8s.container.name": "express",
    "k8s.deployment.name": "express",
    "k8s.namespace.name": "default",
    "k8s.namespace.uid": "f0d2a872-ea9c-4ca6-a92e-b31571bc76d7",
    "k8s.node.name": "",
    "k8s.pod.name": "express-57966494d-pjq8j",
    "k8s.pod.uid": "3b4df96c-9805-480e-a44c-c574739cffa5",
    "k8s.replicaset.name": "express-57966494d"
  },
  "record": {
    "headers": {
      "accept-encoding": "gzip",
      "host": "express:3000",
      "user-agent": "Go-http-client/1.1"
    },
    "level": "info",
    "message": "HTTP GET /members",
    "method": "GET",
    "originalUrl": "/members",
    "protocol": "http",
    "protocol_version": "1.1",
    "query": {},
    "responseTime": 1,
    "status": 200,
    "url": "/members"
  }
}

[jsirianni]

Looks good 🦖

[jsirianni]

We need to handle situations that include arbitary json, such as

{
  "message": "Received 0 database results",
  "level": "info"
}

and

{
  "message": "Received 0 database results",
}

If level exists, parse it, else just parse as json and send to output.