feat: custom monitoring

Signed-off-by: huanggze <loganhuang@yunify.com>

pkg/simple/client/monitoring/prometheus/testdata/metadata-notfound-prom.json

@@ -0,0 +1,5 @@
+{
+  "status":"error",
+  "errorType":"not_found",
+  "error":"specified metadata not found"
+}

pkg/simple/client/monitoring/prometheus/testdata/metadata-notfound-res.json

@@ -0,0 +1 @@
+[]

pkg/simple/client/monitoring/prometheus/testdata/metadata-prom.json

@@ -0,0 +1,25 @@
+{
+  "status": "success",
+  "data": [
+    {
+      "target": {
+        "instance": "127.0.0.1:9090",
+        "job": "prometheus"
+      },
+      "metric": "prometheus_treecache_zookeeper_failures_total",
+      "type": "counter",
+      "help": "The total number of ZooKeeper failures.",
+      "unit": ""
+    },
+    {
+      "target": {
+        "instance": "127.0.0.1:9090",
+        "job": "prometheus"
+      },
+      "metric": "prometheus_tsdb_reloads_total",
+      "type": "counter",
+      "help": "Number of times the database reloaded block data from disk.",
+      "unit": ""
+    }
+  ]
+}

pkg/simple/client/monitoring/prometheus/testdata/metadata-res.json

@@ -0,0 +1,12 @@
+[
+  {
+    "metric": "prometheus_treecache_zookeeper_failures_total",
+    "type": "counter",
+    "help": "The total number of ZooKeeper failures."
+  },
+  {
+    "metric": "prometheus_tsdb_reloads_total",
+    "type": "counter",
+    "help": "Number of times the database reloaded block data from disk."
+  }
+]

pkg/simple/client/monitoring/prometheus/testdata/metrics-error-res.json

@@ -1,6 +1,6 @@
 [
   {
     "metric_name": "cluster_cpu_utilisation",
-    "error": "inconsistent body for response code"
+    "error": "bad_response: inconsistent body for response code"
   }
 ]