Add example configuration files for test-api

test-api is a minimal API server that the agent can connect to. The
implementation does not match the implementation of the actual API
server used in product, it's simply enough to allow the agent to connect
to it and receive checks and tenant information from it.

Signed-off-by: Marcelo E. Magallon <[email protected]>

examples/test-api/README.md

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+test-api input files
+====================
+
+The files in this directory are the input to test-api.
+
+* data.json is used to populate the database. The remote information must be
+  set to something valid, as it will be passed to the agent to publish metrics
+  and logs. Note the agent will need the token listed here.
+
+* test-api.env contains the environment passed to the agent. The example file
+  contains the token (as listed in data.json) that the agent will use to
+  connect to test-api.

examples/test-api/data.json

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+{
+	"tenants": [
+		{
+			"id": 1,
+			"orgId": ...,                             // the org ID of the stack, can be made up
+			"stackId": ...,                           // the stack ID of the instances you are connecting to, can be made up
+			"metricsRemote": {
+				"name": "metrics",
+				"url": "https://.../api/prom",    // URL of instance to push to, not just the base
+				"username": "...",                // username to authenticate to prometheus instance
+				"password": "..."                 // password to authenticate to prometheus instance
+			},
+			"eventsRemote": {
+				"name": "logs",
+				"url": "https://.../loki/api/v1", // URL of instance to push to, not just the base
+				"username": "...",                // username to authenticate to loki instance
+				"password": "..."                 // username to authenticate to loki instance
+			}
+		}
+	],
+	"probes": [
+		{
+			"id": 1,
+			"tenantId": 1,
+			"name": "test-probe"
+		}
+	],
+	"probeTokens": {
+		"1": "..."                                        // random token, base-64 encoded
+	},
+	"checks": [
+		{
+			"id": 1,
+			"tenantId": 1,
+			"frequency": 60000,
+			"timeout": 10000,
+			"enabled": true,
+			"basicMetricsOnly": true,
+			"settings": {
+				"multihttp": {
+					"entries": [
+						{
+							"request": {
+								"method": "GET",
+								"url": "https://httpbin.test.k6.io/status/418"
+							}
+						}
+					]
+				}
+			},
+			"probes": [1],
+			"target": "test",
+			"job": "test"
+		}
+	]
+}