Alert on frequent network errors (#7410)

* Introduce is_frequent util

* Add dirty warn_if_frequent! implementation

* Add freq

* Fix order in condition

* Update

* Update docs

* Fix

* Remove old impl

* Fix errors

* Add wif to av-distr

* Add wif to col prot

* Rename

* Add wif to state-distr

* Address review comments

* Change Freq implementation

* Remove the zero division check

* Make rate explicit

* Fix typo

* Update rate constant

* Introduce explicit rates

* Update docs

* Split errors freq

* Downgrade coarsetime

polkadot/node/gum/src/tests.rs

@@ -50,6 +50,21 @@ fn wo_unnecessary() {
 	);
 }
 
+#[test]
+fn if_frequent() {
+	let a: i32 = 7;
+	let mut f = Freq::new();
+	warn_if_frequent!(
+		freq: f,
+		max_rate: Times::PerSecond(1),
+		target: "bar",
+		a = a,
+		b = ?Y::default(),
+		"fff {c}",
+		c = a,
+	);
+}
+
 #[test]
 fn w_candidate_hash_value_assignment() {
 	let a: i32 = 7;
@@ -102,3 +117,50 @@ fn w_candidate_hash_aliased_unnecessary() {
 		"xxx",
 	);
 }
+
+#[test]
+fn frequent_at_fourth_time() {
+	let mut freq = Freq::new();
+
+	assert!(!freq.is_frequent(Times::PerSecond(1)));
+	assert!(!freq.is_frequent(Times::PerSecond(1)));
+	assert!(!freq.is_frequent(Times::PerSecond(1)));
+
+	assert!(freq.is_frequent(Times::PerSecond(1)));
+}
+
+#[test]
+fn not_frequent_at_fourth_time_if_slow() {
+	let mut freq = Freq::new();
+
+	assert!(!freq.is_frequent(Times::PerSecond(1000)));
+	assert!(!freq.is_frequent(Times::PerSecond(1000)));
+	assert!(!freq.is_frequent(Times::PerSecond(1000)));
+
+	std::thread::sleep(std::time::Duration::from_millis(10));
+	assert!(!freq.is_frequent(Times::PerSecond(1000)));
+}
+
+#[test]
+fn calculate_rate_per_second() {
+	let rate: f32 = Times::PerSecond(100).into();
+	assert_eq!(rate, 100.0)
+}
+
+#[test]
+fn calculate_rate_per_minute() {
+	let rate: f32 = Times::PerMinute(100).into();
+	assert_eq!(rate, 1.6666666)
+}
+
+#[test]
+fn calculate_rate_per_hour() {
+	let rate: f32 = Times::PerHour(100).into();
+	assert_eq!(rate, 0.027777778)
+}
+
+#[test]
+fn calculate_rate_per_day() {
+	let rate: f32 = Times::PerDay(100).into();
+	assert_eq!(rate, 0.0011574074)
+}