Remove im-online completely (polkadot-fellows#466)

After 1.3.0 was enacted and offchain migration clearing `im-online`
offchain storage was run, it is safe to remove any mention of the
`im-online`.

- [x] Does not require a CHANGELOG entry

CC @ordian

Cargo.toml

@@ -124,7 +124,6 @@ pallet-fast-unstake = { version = "35.0.0", default-features = false }
 pallet-glutton = { version = "22.0.0", default-features = false }
 pallet-grandpa = { version = "36.0.0", default-features = false }
 pallet-identity = { version = "36.0.0", default-features = false }
-pallet-im-online = { version = "35.0.0", default-features = false }
 pallet-indices = { version = "36.0.0", default-features = false }
 pallet-insecure-randomness-collective-flip = { version = "24.0.0", default-features = false }
 pallet-membership = { version = "36.0.0", default-features = false }

relay/kusama/Cargo.toml

@@ -57,7 +57,6 @@ frame-executive = { workspace = true }
 frame-metadata-hash-extension = { workspace = true }
 pallet-grandpa = { workspace = true }
 pallet-nis = { workspace = true }
-pallet-im-online = { workspace = true }
 pallet-indices = { workspace = true }
 pallet-message-queue = { workspace = true }
 pallet-mmr = { workspace = true }
@@ -156,7 +155,6 @@ std = [
 	"pallet-election-provider-support-benchmarking?/std",
 	"pallet-fast-unstake/std",
 	"pallet-grandpa/std",
-	"pallet-im-online/std",
 	"pallet-indices/std",
 	"pallet-message-queue/std",
 	"pallet-mmr/std",
@@ -236,7 +234,6 @@ runtime-benchmarks = [
 	"pallet-election-provider-support-benchmarking/runtime-benchmarks",
 	"pallet-fast-unstake/runtime-benchmarks",
 	"pallet-grandpa/runtime-benchmarks",
-	"pallet-im-online/runtime-benchmarks",
 	"pallet-indices/runtime-benchmarks",
 	"pallet-message-queue/runtime-benchmarks",
 	"pallet-mmr/runtime-benchmarks",
@@ -293,7 +290,6 @@ try-runtime = [
 	"pallet-election-provider-multi-phase/try-runtime",
 	"pallet-fast-unstake/try-runtime",
 	"pallet-grandpa/try-runtime",
-	"pallet-im-online/try-runtime",
 	"pallet-indices/try-runtime",
 	"pallet-message-queue/try-runtime",
 	"pallet-mmr/try-runtime",

relay/kusama/src/lib.rs

@@ -2144,12 +2144,6 @@ sp_api::impl_runtime_apis! {
 
 	impl sp_offchain::OffchainWorkerApi<Block> for Runtime {
 		fn offchain_worker(header: &<Block as BlockT>::Header) {
-			use sp_runtime::{traits::Header, DigestItem};
-
-			if header.digest().logs().iter().any(|di| di == &DigestItem::RuntimeEnvironmentUpdated) {
-				pallet_im_online::migration::clear_offchain_storage(Session::validators().len() as u32);
-			}
-
 			Executive::offchain_worker(header)
 		}
 	}

relay/polkadot/Cargo.toml

@@ -54,7 +54,6 @@ pallet-fast-unstake = { workspace = true }
 frame-executive = { workspace = true }
 frame-metadata-hash-extension = { workspace = true }
 pallet-grandpa = { workspace = true }
-pallet-im-online = { workspace = true }
 pallet-indices = { workspace = true }
 pallet-message-queue = { workspace = true }
 pallet-mmr = { workspace = true }
@@ -159,7 +158,6 @@ std = [
 	"pallet-election-provider-support-benchmarking?/std",
 	"pallet-fast-unstake/std",
 	"pallet-grandpa/std",
-	"pallet-im-online/std",
 	"pallet-indices/std",
 	"pallet-message-queue/std",
 	"pallet-mmr/std",
@@ -240,7 +238,6 @@ runtime-benchmarks = [
 	"pallet-election-provider-support-benchmarking/runtime-benchmarks",
 	"pallet-fast-unstake/runtime-benchmarks",
 	"pallet-grandpa/runtime-benchmarks",
-	"pallet-im-online/runtime-benchmarks",
 	"pallet-indices/runtime-benchmarks",
 	"pallet-message-queue/runtime-benchmarks",
 	"pallet-mmr/runtime-benchmarks",
@@ -296,7 +293,6 @@ try-runtime = [
 	"pallet-election-provider-multi-phase/try-runtime",
 	"pallet-fast-unstake/try-runtime",
 	"pallet-grandpa/try-runtime",
-	"pallet-im-online/try-runtime",
 	"pallet-indices/try-runtime",
 	"pallet-message-queue/try-runtime",
 	"pallet-mmr/try-runtime",

relay/polkadot/src/lib.rs

@@ -1630,7 +1630,7 @@ construct_runtime! {
 
 		// Consensus support.
 		// Authorship must be before session in order to note author in the correct session and era
-		// for im-online and staking.
+		// for staking.
 		Authorship: pallet_authorship = 6,
 		Staking: pallet_staking = 7,
 		Offences: pallet_offences = 8,
@@ -2429,12 +2429,6 @@ sp_api::impl_runtime_apis! {
 
 	impl sp_offchain::OffchainWorkerApi<Block> for Runtime {
 		fn offchain_worker(header: &<Block as BlockT>::Header) {
-			use sp_runtime::{traits::Header, DigestItem};
-
-			if header.digest().logs().iter().any(|di| di == &DigestItem::RuntimeEnvironmentUpdated) {
-				pallet_im_online::migration::clear_offchain_storage(Session::validators().len() as u32);
-			}
-
 			Executive::offchain_worker(header)
 		}
 	}