introduce log-target constant to more frame pallets (#13116)

* introduce log-target constant to more frame pallets

* cargo fmt

* make LOG_TARGET in session public

* Update frame/elections-phragmen/src/lib.rs

Co-authored-by: Bastian Köcher <git@kchr.de>

* Update frame/elections-phragmen/src/migrations/v3.rs

Co-authored-by: Bastian Köcher <git@kchr.de>

* Update frame/elections-phragmen/src/migrations/v3.rs

Co-authored-by: Bastian Köcher <git@kchr.de>

* Update frame/elections-phragmen/src/migrations/v3.rs

Co-authored-by: Bastian Köcher <git@kchr.de>

* move LOG_TARGET=runtime::session_historical to migrations module, where it's actually used

Co-authored-by: Bastian Köcher <git@kchr.de>

substrate/frame/assets/src/lib.rs

@@ -175,6 +175,7 @@ pub use pallet::*;
 pub use weights::WeightInfo;
 
 type AccountIdLookupOf<T> = <<T as frame_system::Config>::Lookup as StaticLookup>::Source;
+const LOG_TARGET: &str = "runtime::assets";
 
 /// Trait with callbacks that are executed after successfull asset creation or destruction.
 pub trait AssetsCallback<AssetId, AccountId> {

substrate/frame/assets/src/migration.rs

@@ -75,10 +75,18 @@ pub mod v1 {
 					Some(old_value.migrate_to_v1())
 				});
 				current_version.put::<Pallet<T>>();
-				log::info!(target: "runtime::assets", "Upgraded {} pools, storage to version {:?}", translated, current_version);
+				log::info!(
+					target: LOG_TARGET,
+					"Upgraded {} pools, storage to version {:?}",
+					translated,
+					current_version
+				);
 				T::DbWeight::get().reads_writes(translated + 1, translated + 1)
 			} else {
-				log::info!(target: "runtime::assets",  "Migration did not execute. This probably should be removed");
+				log::info!(
+					target: LOG_TARGET,
+					"Migration did not execute. This probably should be removed"
+				);
 				T::DbWeight::get().reads(1)
 			}
 		}