apollo_dashboard: add microseconds units to tokio panels

Author: Itay-Tsabary-Starkware

crates/apollo_dashboard/resources/dev_grafana.json

@@ -1270,6 +1270,7 @@
             "tokio_total_busy_duration{cluster=~\"$cluster\", namespace=~\"$namespace\"}"
           ],
           "extra_params": {
+            "unit": "µs",
             "legends": [
               "{{pod}}"
             ]
@@ -1283,6 +1284,7 @@
             "tokio_min_busy_duration{cluster=~\"$cluster\", namespace=~\"$namespace\"}"
           ],
           "extra_params": {
+            "unit": "µs",
             "legends": [
               "{{pod}}"
             ]
@@ -1296,6 +1298,7 @@
             "tokio_max_busy_duration{cluster=~\"$cluster\", namespace=~\"$namespace\"}"
           ],
           "extra_params": {
+            "unit": "µs",
             "legends": [
               "{{pod}}"
             ]

crates/apollo_dashboard/src/dashboard.rs

@@ -80,6 +80,7 @@ pub enum Unit {
     // The expected values for PercentUnit are [0,1]
     PercentUnit,
     MB,
+    Microseconds,
 }
 
 impl Unit {
@@ -89,6 +90,7 @@ impl Unit {
             Unit::Seconds => "s",
             Unit::PercentUnit => "percentunit",
             Unit::MB => "decmbytes",
+            Unit::Microseconds => "µs",
         }
     }
 }

crates/apollo_dashboard/src/panels/tokio.rs

@@ -9,22 +9,25 @@ use apollo_monitoring_endpoint::tokio_metrics::{
     TOKIO_WORKERS_COUNT,
 };
 
-use crate::dashboard::{Panel, PanelType, Row};
+use crate::dashboard::{Panel, PanelType, Row, Unit};
 
 // TODO(Matan/Tsabary): Use units for Tokio panels.
 const TOKIO_PANEL_LEGENDS: &[&str] = &["{{pod}}"];
 
 fn get_panel_tokio_total_busy_duration_micros() -> Panel {
     Panel::from_counter(&TOKIO_TOTAL_BUSY_DURATION_MICROS, PanelType::TimeSeries)
         .with_legends(TOKIO_PANEL_LEGENDS.to_vec())
+        .with_unit(Unit::Microseconds)
 }
 fn get_panel_tokio_min_busy_duration_micros() -> Panel {
     Panel::from_counter(&TOKIO_MIN_BUSY_DURATION_MICROS, PanelType::TimeSeries)
         .with_legends(TOKIO_PANEL_LEGENDS.to_vec())
+        .with_unit(Unit::Microseconds)
 }
 fn get_panel_tokio_max_busy_duration_micros() -> Panel {
     Panel::from_counter(&TOKIO_MAX_BUSY_DURATION_MICROS, PanelType::TimeSeries)
         .with_legends(TOKIO_PANEL_LEGENDS.to_vec())
+        .with_unit(Unit::Microseconds)
 }
 
 fn get_panel_tokio_total_park_count() -> Panel {