improve 04-channel logging (#692)

## Description



closes: #674 

---

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write a little note why.

- [x] Targeted PR against correct branch (see [CONTRIBUTING.md](https://github.com/cosmos/ibc-go/blob/master/CONTRIBUTING.md#pr-targeting))
- [x] Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
- [x] Code follows the [module structure standards](https://github.com/cosmos/cosmos-sdk/blob/master/docs/building-modules/structure.md).
- [x] Wrote unit and integration [tests](https://github.com/cosmos/ibc-go/blob/master/CONTRIBUTING.md#testing)
- [x] Updated relevant documentation (`docs/`) or specification (`x/<module>/spec/`)
- [x] Added relevant `godoc` [comments](https://blog.golang.org/godoc-documenting-go-code).
- [x] Added a relevant changelog entry to the `Unreleased` section in `CHANGELOG.md`
- [x] Re-reviewed `Files changed` in the Github PR explorer
- [x] Review `Codecov Report` in the comment section below once CI passes

CHANGELOG.md

@@ -53,6 +53,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ### Improvements
 
+* (channel) [\#692](https://github.com/cosmos/ibc-go/pull/692) Minimize channel logging by only emitting the packet sequence, source port/channel, destination port/channel upon packet receives, acknowledgements and timeouts.
 * [\#383](https://github.com/cosmos/ibc-go/pull/383) Adds helper functions for merging and splitting middleware versions from the underlying app version.
 * (modules/core/05-port) [\#288](https://github.com/cosmos/ibc-go/issues/288) Making the 05-port keeper function IsBound public. The IsBound function checks if the provided portID is already binded to a module.
 * (channel) [\#644](https://github.com/cosmos/ibc-go/pull/644) Adds `GetChannelConnection` to the ChannelKeeper. This function returns the connectionID and connection state associated with a channel. 

modules/core/04-channel/keeper/packet.go

@@ -2,7 +2,6 @@ package keeper
 
 import (
 	"bytes"
-	"fmt"
 	"time"
 
 	sdk "github.com/cosmos/cosmos-sdk/types"
@@ -135,6 +134,7 @@ func (k Keeper) SendPacket(
 		"dst_port", packet.GetDestPort(),
 		"dst_channel", packet.GetDestChannel(),
 	)
+
 	return nil
 }
 
@@ -281,7 +281,14 @@ func (k Keeper) RecvPacket(
 	}
 
 	// log that a packet has been received & executed
-	k.Logger(ctx).Info("packet received", "packet", fmt.Sprintf("%v", packet))
+	k.Logger(ctx).Info(
+		"packet received",
+		"sequence", packet.GetSequence(),
+		"src_port", packet.GetSourcePort(),
+		"src_channel", packet.GetSourceChannel(),
+		"dst_port", packet.GetDestPort(),
+		"dst_channel", packet.GetDestChannel(),
+	)
 
 	// emit an event that the relayer can query for
 	EmitRecvPacketEvent(ctx, packet, channel)
@@ -345,7 +352,14 @@ func (k Keeper) WriteAcknowledgement(
 	)
 
 	// log that a packet acknowledgement has been written
-	k.Logger(ctx).Info("acknowledged written", "packet", fmt.Sprintf("%v", packet))
+	k.Logger(ctx).Info(
+		"acknowledgement written",
+		"sequence", packet.GetSequence,
+		"src_port", packet.GetSourcePort(),
+		"src_channel", packet.GetSourceChannel(),
+		"dst_port", packet.GetDestPort(),
+		"dst_channel", packet.GetDestChannel(),
+	)
 
 	EmitWriteAcknowledgementEvent(ctx, packet, channel, acknowledgement)
 
@@ -472,7 +486,14 @@ func (k Keeper) AcknowledgePacket(
 	k.deletePacketCommitment(ctx, packet.GetSourcePort(), packet.GetSourceChannel(), packet.GetSequence())
 
 	// log that a packet has been acknowledged
-	k.Logger(ctx).Info("packet acknowledged", "packet", fmt.Sprintf("%v", packet))
+	k.Logger(ctx).Info(
+		"packet acknowledged",
+		"sequence", packet.GetSequence,
+		"src_port", packet.GetSourcePort(),
+		"src_channel", packet.GetSourceChannel(),
+		"dst_port", packet.GetDestPort(),
+		"dst_channel", packet.GetDestChannel(),
+	)
 
 	// emit an event marking that we have processed the acknowledgement
 	EmitAcknowledgePacketEvent(ctx, packet, channel)

modules/core/04-channel/keeper/timeout.go

@@ -2,7 +2,6 @@ package keeper
 
 import (
 	"bytes"
-	"fmt"
 
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
@@ -157,7 +156,14 @@ func (k Keeper) TimeoutExecuted(
 		k.SetChannel(ctx, packet.GetSourcePort(), packet.GetSourceChannel(), channel)
 	}
 
-	k.Logger(ctx).Info("packet timed-out", "packet", fmt.Sprintf("%v", packet))
+	k.Logger(ctx).Info(
+		"packet timed-out",
+		"sequence", packet.GetSequence(),
+		"src_port", packet.GetSourcePort(),
+		"src_channel", packet.GetSourceChannel(),
+		"dst_port", packet.GetDestPort(),
+		"dst_channel", packet.GetDestChannel(),
+	)
 
 	// emit an event marking that we have processed the timeout
 	EmitTimeoutPacketEvent(ctx, packet, channel)