Use LOG_TARGET in consensus related crates (#12875)

* Use shared LOG_TARGET in consensus related crates
* Rename target from "afg" to "grandpa"

substrate/frame/grandpa/src/equivocation.rs

@@ -52,7 +52,7 @@ use sp_staking::{
 	SessionIndex,
 };
 
-use super::{Call, Config, Pallet};
+use super::{Call, Config, Pallet, LOG_TARGET};
 
 /// A trait with utility methods for handling equivocation reports in GRANDPA.
 /// The offence type is generic, and the trait provides , reporting an offence
@@ -170,15 +170,9 @@ where
 		};
 
 		match SubmitTransaction::<T, Call<T>>::submit_unsigned_transaction(call.into()) {
-			Ok(()) => log::info!(
-				target: "runtime::afg",
-				"Submitted GRANDPA equivocation report.",
-			),
-			Err(e) => log::error!(
-				target: "runtime::afg",
-				"Error submitting equivocation report: {:?}",
-				e,
-			),
+			Ok(()) => log::info!(target: LOG_TARGET, "Submitted GRANDPA equivocation report.",),
+			Err(e) =>
+				log::error!(target: LOG_TARGET, "Error submitting equivocation report: {:?}", e,),
 		}
 
 		Ok(())
@@ -211,7 +205,7 @@ impl<T: Config> Pallet<T> {
 				TransactionSource::Local | TransactionSource::InBlock => { /* allowed */ },
 				_ => {
 					log::warn!(
-						target: "runtime::afg",
+						target: LOG_TARGET,
 						"rejecting unsigned report equivocation transaction because it is not local/in-block."
 					);
 

substrate/frame/grandpa/src/lib.rs

@@ -70,6 +70,8 @@ pub use equivocation::{
 
 pub use pallet::*;
 
+const LOG_TARGET: &str = "runtime::grandpa";
+
 #[frame_support::pallet]
 pub mod pallet {
 	use super::*;

substrate/frame/grandpa/src/migrations/v4.rs

@@ -15,6 +15,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+use crate::LOG_TARGET;
 use frame_support::{
 	traits::{Get, StorageVersion},
 	weights::Weight,
@@ -34,14 +35,14 @@ pub const OLD_PREFIX: &[u8] = b"GrandpaFinality";
 pub fn migrate<T: crate::Config, N: AsRef<str>>(new_pallet_name: N) -> Weight {
 	if new_pallet_name.as_ref().as_bytes() == OLD_PREFIX {
 		log::info!(
-			target: "runtime::afg",
+			target: LOG_TARGET,
 			"New pallet name is equal to the old prefix. No migration needs to be done.",
 		);
 		return Weight::zero()
 	}
 	let storage_version = StorageVersion::get::<crate::Pallet<T>>();
 	log::info!(
-		target: "runtime::afg",
+		target: LOG_TARGET,
 		"Running migration to v3.1 for grandpa with storage version {:?}",
 		storage_version,
 	);