refactor: rm default behavior annotations

Author: Devdutt Shenoi

server/src/hottier.rs

@@ -59,13 +59,9 @@ pub const CURRENT_HOT_TIER_VERSION: &str = "v2";
 #[derive(Debug, Deserialize, Serialize, Default)]
 pub struct StreamHotTier {
     pub version: String,
-    #[serde(rename = "size")]
     pub size: u64,
-    #[serde(skip_serializing_if = "Option::is_none")]
     pub used_size: Option<u64>,
-    #[serde(skip_serializing_if = "Option::is_none")]
     pub available_size: Option<u64>,
-    #[serde(skip_serializing_if = "Option::is_none")]
     pub oldest_date_time_entry: Option<String>,
 }