refactor monitoring (#1751)

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

pkg/simple/client/monitoring/interface.go

@@ -1,32 +1,41 @@
 package monitoring
 
-type ClusterQuery struct {
+import "time"
+
+const (
+	StatusSuccess    = "success"
+	StatusError      = "error"
+	MetricTypeMatrix = "matrix"
+	MetricTypeVector = "vector"
+)
+
+type Metric struct {
+	MetricName string `json:"metric_name,omitempty" description:"metric name, eg. scheduler_up_sum"`
+	Status     string `json:"status" description:"result status, one of error, success"`
+	MetricData `json:"data" description:"actual metric result"`
+	ErrorType  string `json:"errorType,omitempty"`
+	Error      string `json:"error,omitempty"`
 }
 
-type ClusterMetrics struct {
+type MetricData struct {
+	MetricType   string        `json:"resultType" description:"result type, one of matrix, vector"`
+	MetricValues []MetricValue `json:"result" description:"metric data including labels, time series and values"`
 }
 
-type WorkspaceQuery struct {
+type Point [2]float64
+
+type MetricValue struct {
+	Metadata map[string]string `json:"metric,omitempty" description:"time series labels"`
+	Sample   Point             `json:"value,omitempty" description:"time series, values of vector type"`
+	Series   []Point           `json:"values,omitempty" description:"time series, values of matrix type"`
 }
 
-type WorkspaceMetrics struct {
-}
-
-type NamespaceQuery struct {
-}
-
-type NamespaceMetrics struct {
-}
-
-// Interface defines all the abstract behaviors of monitoring
 type Interface interface {
+	// The `stmts` defines statements, expressions or rules (eg. promql in Prometheus) for querying specific metrics.
+	GetMetrics(stmts []string, time time.Time) ([]Metric, error)
+	GetMetricsOverTime(stmts []string, start, end time.Time, step time.Duration) ([]Metric, error)
 
-	// Get
-	GetClusterMetrics(query ClusterQuery) ClusterMetrics
-
-	//
-	GetWorkspaceMetrics(query WorkspaceQuery) WorkspaceMetrics
-
-	//
-	GetNamespaceMetrics(query NamespaceQuery) NamespaceMetrics
+	// Get named metrics (eg. node_cpu_usage)
+	GetNamedMetrics(time time.Time, opt QueryOption) ([]Metric, error)
+	GetNamedMetricsOverTime(start, end time.Time, step time.Duration, opt QueryOption) ([]Metric, error)
 }