delete more imports to quiet cargo

scale rocksdb background jobs and subcompactions

change rocksdb default error level to info from error

delete unused num_threads function

fix warns from cargo

src/service/resolver/actual.rs

@@ -306,14 +306,12 @@ impl super::Service {
 
 	#[tracing::instrument(name = "srv", level = "debug", skip(self))]
 	async fn query_srv_record(&self, hostname: &'_ str) -> Result<Option<FedDest>> {
-		let hostnames =
-			[format!("_matrix-fed._tcp.{hostname}."), format!("_matrix._tcp.{hostname}.")];
-
-		for hostname in hostnames {
 		self.services.server.check_running()?;
 
 		debug!("querying SRV for {hostname:?}");
-			let hostname = hostname.trim_end_matches('.');
+
+		let hostname_suffix = format!("_matrix-fed._tcp.{hostname}.");
+		let hostname = hostname_suffix.trim_end_matches('.');
 		match self.resolver.resolver.srv_lookup(hostname).await {
 			| Err(e) => Self::handle_resolve_error(&e, hostname)?,
 			| Ok(result) => {
@@ -328,7 +326,6 @@ impl super::Service {
 				}));
 			},
 		}
-		}
 
 		Ok(None)
 	}

src/service/rooms/event_handler/handle_outlier_pdu.rs

@@ -123,7 +123,7 @@ where
 
 	// The original create event must be in the auth events
 	if !auth_events.contains_key(&(StateEventType::RoomCreate, String::new().into())) {
-		return Err!(Request(InvalidParam("Incoming event refers to wrong create event. event_id={event_id}")));
+		return Err!(Request(InvalidParam("Incoming event refers to wrong create event.")));
 	}
 
 	let state_fetch = |ty: &StateEventType, sk: &str| {