chore: refactor config (numaproj#2873)

Signed-off-by: Vigith Maurice <vigith@gmail.com>
Signed-off-by: Yashash H L <yashashhl25@gmail.com>
Co-authored-by: Yashash H L <yashashhl25@gmail.com>

Author: vigith

rust/numaflow-core/src/config/components.rs

@@ -0,0 +1,35 @@
+const DEFAULT_METRICS_PORT: u16 = 2469;
+const DEFAULT_LAG_CHECK_INTERVAL_IN_SECS: u16 = 5;
+const DEFAULT_LAG_REFRESH_INTERVAL_IN_SECS: u16 = 3;
+const DEFAULT_LOOKBACK_WINDOW_IN_SECS: u16 = 120;
+
+#[derive(Debug, Clone, PartialEq)]
+pub(crate) struct MetricsConfig {
+    // TODO(lookback) - using new implementation for monovertex right now,
+    // remove extra fields from here once new corresponding pipeline changes
+    // in the daemon are done.
+    pub metrics_server_listen_port: u16,
+    pub lag_check_interval_in_secs: u16,
+    pub lag_refresh_interval_in_secs: u16,
+    pub lookback_window_in_secs: u16,
+}
+
+impl Default for MetricsConfig {
+    fn default() -> Self {
+        Self {
+            metrics_server_listen_port: DEFAULT_METRICS_PORT,
+            lag_check_interval_in_secs: DEFAULT_LAG_CHECK_INTERVAL_IN_SECS,
+            lag_refresh_interval_in_secs: DEFAULT_LAG_REFRESH_INTERVAL_IN_SECS,
+            lookback_window_in_secs: DEFAULT_LOOKBACK_WINDOW_IN_SECS,
+        }
+    }
+}
+
+impl MetricsConfig {
+    pub(crate) fn with_lookback_window_in_secs(lookback_window_in_secs: u16) -> Self {
+        MetricsConfig {
+            lookback_window_in_secs,
+            ..Default::default()
+        }
+    }
+}