IMG-52: rename metrics to monitoring (#1498)

* Removed bufpool

* metrics -> monitoring

* metricsMeta -> monitoringMeta

* monitoring.Meta -> Filter

monitoring/monitoring_test.go

@@ -0,0 +1,37 @@
+package monitoring
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestMetaFilter(t *testing.T) {
+	// Create a Meta with some test data
+	meta := Meta{
+		"key1": "value1",
+		"key2": "value2",
+		"key3": "value3",
+		"key4": 42,
+	}
+
+	// Test filtering with existing keys
+	filtered := meta.Filter("key1", "key3")
+
+	// Check that filtered meta has the correct keys
+	require.Len(t, filtered, 2)
+	require.Equal(t, "value1", filtered["key1"])
+	require.Equal(t, "value3", filtered["key3"])
+
+	// Check that non-requested keys are not present
+	require.NotContains(t, filtered, "key2")
+	require.NotContains(t, filtered, "key4")
+
+	// Test filtering with non-existing keys
+	filtered2 := meta.Filter("nonexistent")
+	require.Empty(t, filtered2)
+
+	// Test filtering with empty parameters
+	filtered3 := meta.Filter()
+	require.Empty(t, filtered3)
+}