Update comments on removing fields.

Indicate the last time that (now) reserved fields were used, and update
comments on when fields can be made 'reserved', based on what release
branches would be affected.

BUG=chromium:1126855
TEST=generate

Change-Id: Ica1219ed1a2a33ce652863a648b00283c2447bd4
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/proto/+/2664728
Commit-Queue: LaMont Jones <lamontjones@chromium.org>
Reviewed-by: Alex Klein <saklein@chromium.org>
Reviewed-by: George Engelbrecht <engeg@google.com>
diff --git a/go/chromite/api/depgraph.pb.go b/go/chromite/api/depgraph.pb.go
index 98af6a4..73a01a6 100644
--- a/go/chromite/api/depgraph.pb.go
+++ b/go/chromite/api/depgraph.pb.go
@@ -194,7 +194,8 @@
 	// The sysroot whose dependency graph is being created.  If no sysroot is
 	// being used, may be unspecified.
 	Sysroot *Sysroot `protobuf:"bytes,4,opt,name=sysroot,proto3" json:"sysroot,omitempty"`
-	// TODO(crbug/1081828): drop when no longer used.
+	// TODO(crbug/1081828): drop when all supported release branches are no longer
+	// using this.
 	// DEPRECATED: Use sysroot instead.
 	// The board whose dependency graph is being created.  If both sysroot and
 	// build_target are given, sysroot is used.
diff --git a/go/chromite/api/firmware.pb.go b/go/chromite/api/firmware.pb.go
index 336aaa3..5ba0664 100644
--- a/go/chromite/api/firmware.pb.go
+++ b/go/chromite/api/firmware.pb.go
@@ -967,68 +967,68 @@
 func init() { proto.RegisterFile("chromite/api/firmware.proto", fileDescriptor_7e3de92302c5ee13) }
 
 var fileDescriptor_7e3de92302c5ee13 = []byte{
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 }
 
 // Reference imports to suppress errors if they are not otherwise used.
diff --git a/go/chromite/api/sysroot.pb.go b/go/chromite/api/sysroot.pb.go
index ba2e6b9..86fe52b 100644
--- a/go/chromite/api/sysroot.pb.go
+++ b/go/chromite/api/sysroot.pb.go
@@ -894,67 +894,67 @@
 func init() { proto.RegisterFile("chromite/api/sysroot.proto", fileDescriptor_f8efa85b3e33e938) }
 
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 }
 
 // Reference imports to suppress errors if they are not otherwise used.
diff --git a/go/chromite/api/test.pb.go b/go/chromite/api/test.pb.go
index 5006bb0..6a41441 100644
--- a/go/chromite/api/test.pb.go
+++ b/go/chromite/api/test.pb.go
@@ -69,7 +69,9 @@
 	// Skipped packages.
 	// Deprecated in favor of package_blocklist.
 	// Left in place for compatibility for now.
-	// TODO: Change to reserved after 2021-06-01 and recipes have been updated.
+	// TODO(crbug/1126855): Change to reserved after branches R87 and earlier are
+	// no longer supported, and recipes have stopped setting the field.
+	// Last used in R87.  Remove no earlier than 2021-06-01.
 	PackageBlacklist []*chromiumos.PackageInfo `protobuf:"bytes,5,rep,name=package_blacklist,json=packageBlacklist,proto3" json:"package_blacklist,omitempty"`
 	// Packages to be tested.
 	// Defaults to all testable packages when none are given.
diff --git a/go/chromite/api/toolchain.pb.go b/go/chromite/api/toolchain.pb.go
index 91de6b9..b6a793b 100644
--- a/go/chromite/api/toolchain.pb.go
+++ b/go/chromite/api/toolchain.pb.go
@@ -921,11 +921,13 @@
 // For semantics around ctx use and closing/ending streaming RPCs, please refer to https://godoc.org/google.golang.org/grpc#ClientConn.NewStream.
 type ToolchainServiceClient interface {
 	// DEPRECATED for recipes: used only by legacy toolchain builders.
-	// See also crbug/1019868.
+	// See also crbug/1019868.  R87 is the last release branch that supports the
+	// legacy toolchain builders.
 	// Update Chrome ebuild with most recent unvetted orderfile
 	UpdateEbuildWithAFDOArtifacts(ctx context.Context, in *VerifyAFDOArtifactsRequest, opts ...grpc.CallOption) (*VerifyAFDOArtifactsResponse, error)
 	// DEPRECATED for recipes: used only by legacy toolchain builders.
-	// See also crbug/1019868.
+	// See also crbug/1019868.  R87 is the last release branch that supports the
+	// legacy toolchain builders.
 	// Copy the orderfile from unvetted GS bucket to vetted bucket.
 	UploadVettedAFDOArtifacts(ctx context.Context, in *VerifyAFDOArtifactsRequest, opts ...grpc.CallOption) (*VerifyAFDOArtifactsResponse, error)
 	// Prepare to build toolchain artifacts.  This will be called twice:
@@ -994,11 +996,13 @@
 // ToolchainServiceServer is the server API for ToolchainService service.
 type ToolchainServiceServer interface {
 	// DEPRECATED for recipes: used only by legacy toolchain builders.
-	// See also crbug/1019868.
+	// See also crbug/1019868.  R87 is the last release branch that supports the
+	// legacy toolchain builders.
 	// Update Chrome ebuild with most recent unvetted orderfile
 	UpdateEbuildWithAFDOArtifacts(context.Context, *VerifyAFDOArtifactsRequest) (*VerifyAFDOArtifactsResponse, error)
 	// DEPRECATED for recipes: used only by legacy toolchain builders.
-	// See also crbug/1019868.
+	// See also crbug/1019868.  R87 is the last release branch that supports the
+	// legacy toolchain builders.
 	// Copy the orderfile from unvetted GS bucket to vetted bucket.
 	UploadVettedAFDOArtifacts(context.Context, *VerifyAFDOArtifactsRequest) (*VerifyAFDOArtifactsResponse, error)
 	// Prepare to build toolchain artifacts.  This will be called twice:
diff --git a/go/chromiumos/common.pb.go b/go/chromiumos/common.pb.go
index 073b6b1..d06492d 100644
--- a/go/chromiumos/common.pb.go
+++ b/go/chromiumos/common.pb.go
@@ -3914,203 +3914,203 @@
 func init() { proto.RegisterFile("chromiumos/common.proto", fileDescriptor_fa0b57c3d7d4c63b) }
 
 var fileDescriptor_fa0b57c3d7d4c63b = []byte{
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+	0x3d, 0xbe, 0xb4, 0xf4, 0x35, 0x57, 0x56, 0x40, 0x5d, 0xfc, 0x59, 0x1c, 0x72, 0x61, 0x0a, 0xbc,
+	0x0f, 0x85, 0x60, 0x43, 0x38, 0x47, 0x63, 0xdd, 0xf5, 0xa5, 0x70, 0x5a, 0x6d, 0xad, 0xa3, 0xb1,
+	0x4e, 0xf2, 0x5a, 0x68, 0x65, 0xd3, 0x39, 0xaf, 0x67, 0xab, 0xfe, 0x3c, 0xe3, 0xba, 0x91, 0x21,
+	0xd9, 0x9e, 0xed, 0x8f, 0x35, 0x36, 0x3d, 0xb4, 0x68, 0x9d, 0x81, 0xdb, 0xec, 0xdd, 0xcf, 0x73,
+	0x4a, 0xeb, 0x0c, 0xd8, 0x3c, 0xfa, 0x14, 0xd6, 0xc7, 0x87, 0xcf, 0x06, 0x86, 0xdd, 0x57, 0x3b,
+	0xe6, 0xa8, 0x3b, 0xf9, 0x56, 0x17, 0xb6, 0xef, 0x1d, 0x57, 0xc0, 0x2e, 0x1f, 0xef, 0xb3, 0x11,
+	0x34, 0x8e, 0x40, 0x3e, 0x4a, 0xa6, 0x13, 0x28, 0x49, 0xa6, 0x6a, 0xab, 0xf4, 0x55, 0x28, 0x36,
+	0xd4, 0x03, 0x3a, 0x75, 0x4d, 0x9f, 0x02, 0xf2, 0x90, 0x11, 0x1b, 0x5c, 0x4d, 0x50, 0x1f, 0x8b,
+	0x4d, 0x14, 0xc3, 0x17, 0xe1, 0x6c, 0x4b, 0x50, 0x5a, 0x6a, 0xbb, 0x59, 0xe1, 0x5a, 0x82, 0xda,
+	0xe4, 0xf6, 0xeb, 0x32, 0x47, 0x8f, 0x04, 0x18, 0x0a, 0x5c, 0xbb, 0x25, 0x33, 0x64, 0x55, 0xac,
+	0x0b, 0x0a, 0x4a, 0xe0, 0x02, 0x40, 0x8b, 0x0b, 0xd6, 0x49, 0xca, 0xdc, 0x14, 0x25, 0x49, 0xa8,
+	0xa8, 0xb5, 0x36, 0xa5, 0x63, 0x82, 0x15, 0xb4, 0x42, 0x4f, 0x17, 0x55, 0x91, 0x34, 0xf6, 0x38,
+	0x22, 0xa0, 0x55, 0x6a, 0x83, 0x50, 0x6e, 0x8b, 0xf5, 0x8a, 0x5a, 0x97, 0x6b, 0x0a, 0x4a, 0xe1,
+	0xb3, 0xb0, 0xe6, 0x9f, 0x2c, 0x54, 0x5e, 0x96, 0xaa, 0x62, 0x0d, 0xa5, 0xa9, 0x70, 0xbe, 0x29,
+	0xa8, 0x44, 0x68, 0xca, 0xa4, 0x85, 0x32, 0xd4, 0x00, 0xd7, 0x50, 0x8e, 0xf0, 0x3b, 0xe2, 0xae,
+	0xa0, 0x20, 0xa0, 0x8c, 0xd5, 0x66, 0x83, 0x6f, 0xab, 0x6d, 0x49, 0x6c, 0x51, 0xd3, 0x14, 0x74,
+	0x99, 0x8a, 0xaf, 0xf1, 0x82, 0xda, 0xe2, 0x48, 0x99, 0xab, 0xd7, 0xd1, 0x95, 0x52, 0x32, 0x9d,
+	0x45, 0xc5, 0x52, 0x32, 0xbd, 0x89, 0xae, 0x15, 0x7f, 0x9d, 0x86, 0x4c, 0xd0, 0x8e, 0xf0, 0x27,
+	0x8b, 0xca, 0xfe, 0xc1, 0x49, 0x3b, 0xda, 0xcb, 0x2b, 0xff, 0xbf, 0x17, 0x56, 0xfe, 0x92, 0x0a,
+	0x66, 0x8a, 0xff, 0x47, 0xd1, 0xe2, 0x7f, 0xba, 0xa0, 0xf8, 0x4f, 0xaf, 0xf0, 0x7b, 0x56, 0xff,
+	0xa5, 0xbf, 0x25, 0x8f, 0xab, 0xf5, 0x9b, 0x70, 0xbd, 0x2d, 0xed, 0x0a, 0x84, 0xad, 0xbd, 0xc3,
+	0xac, 0x5a, 0xaf, 0xef, 0x36, 0x54, 0x99, 0x54, 0x04, 0x42, 0xcb, 0x18, 0x65, 0x71, 0x09, 0xae,
+	0x1e, 0x43, 0x93, 0xc3, 0x57, 0xa1, 0xe8, 0xa1, 0xf8, 0x3a, 0x27, 0xd5, 0xd4, 0x3d, 0x8e, 0x48,
+	0xa2, 0x54, 0x53, 0xd8, 0x56, 0x40, 0x79, 0x7c, 0x05, 0x36, 0x42, 0x9a, 0x18, 0x7b, 0xb3, 0x26,
+	0xbb, 0xd8, 0x02, 0x7e, 0x03, 0x6e, 0xcd, 0xda, 0x51, 0x16, 0x24, 0x7e, 0xa7, 0xc1, 0x91, 0x87,
+	0x2a, 0x57, 0xad, 0x78, 0xa4, 0x6b, 0xf8, 0x36, 0xdc, 0x38, 0x09, 0x21, 0xc2, 0xaf, 0xc1, 0x66,
+	0x40, 0xf8, 0x50, 0x20, 0x92, 0x50, 0x57, 0xf9, 0xbd, 0x66, 0x88, 0x64, 0x1d, 0xdf, 0x80, 0x6b,
+	0x21, 0xb5, 0x73, 0x89, 0x70, 0x84, 0xc8, 0x77, 0x72, 0x8a, 0xe8, 0xec, 0x94, 0xb2, 0xb9, 0x24,
+	0xe7, 0x68, 0x84, 0x02, 0x12, 0x22, 0xd4, 0x05, 0x4e, 0x11, 0x42, 0xf8, 0xf3, 0xc7, 0xc5, 0xa0,
+	0x29, 0x90, 0xaa, 0x4b, 0x7a, 0x81, 0xb6, 0x15, 0x0f, 0x5f, 0x11, 0xca, 0xed, 0x9a, 0x5a, 0x16,
+	0x25, 0x8e, 0xec, 0xa3, 0x8b, 0xb8, 0x08, 0x17, 0x5a, 0xb2, 0x5c, 0xe7, 0x77, 0x38, 0x51, 0xf2,
+	0x53, 0xe0, 0xf6, 0x94, 0x0d, 0x2a, 0xdf, 0x63, 0x62, 0x5a, 0x9b, 0x44, 0xa6, 0xd2, 0xd4, 0xaa,
+	0x4c, 0x54, 0x4e, 0xaa, 0x10, 0x59, 0xac, 0xa8, 0x75, 0x51, 0x6a, 0x3f, 0x42, 0x97, 0xf0, 0x25,
+	0x38, 0xef, 0x66, 0x91, 0x27, 0x9c, 0xb2, 0xa3, 0x56, 0x44, 0xae, 0x26, 0xc9, 0x8a, 0xa0, 0xa0,
+	0x22, 0x53, 0x2d, 0x37, 0x9a, 0x62, 0x5d, 0x20, 0x2a, 0x69, 0x2b, 0xb4, 0xfd, 0xd4, 0xe5, 0x1a,
+	0xda, 0x2c, 0x25, 0xd3, 0x31, 0x04, 0xa5, 0x64, 0xfa, 0x32, 0xeb, 0x2f, 0x57, 0xd1, 0xb5, 0xe2,
+	0xef, 0x12, 0xb0, 0xc2, 0x86, 0x14, 0xfc, 0x78, 0x51, 0x57, 0xf9, 0xd7, 0x93, 0xcc, 0x38, 0x2f,
+	0xef, 0x28, 0x4f, 0x17, 0x76, 0x94, 0x25, 0x84, 0xcf, 0x74, 0x93, 0x2f, 0xa3, 0xdd, 0xe4, 0xd1,
+	0x82, 0x6e, 0x72, 0x3a, 0x65, 0xdf, 0xb7, 0x4e, 0x72, 0xeb, 0x98, 0x46, 0xc2, 0xb2, 0x7f, 0xad,
+	0xf8, 0xe7, 0x04, 0xa4, 0xbc, 0xc1, 0x12, 0x3f, 0x5d, 0x94, 0xf3, 0xb7, 0x4f, 0x36, 0x99, 0xbe,
+	0x3c, 0xeb, 0x9f, 0x2c, 0xcc, 0xfa, 0x52, 0xe2, 0x67, 0xf2, 0xfe, 0x7f, 0xd1, 0xbc, 0x3f, 0x5e,
+	0x90, 0xf7, 0xd3, 0xaa, 0xfb, 0x01, 0x67, 0xde, 0x3b, 0x10, 0x2c, 0x9f, 0x79, 0x4f, 0xc0, 0xab,
+	0xca, 0xfc, 0x5c, 0xf1, 0xaf, 0x2e, 0xf3, 0x51, 0x75, 0x3f, 0xd0, 0xcc, 0xff, 0x36, 0x01, 0x49,
+	0x7a, 0x96, 0xc3, 0xfb, 0x8b, 0xd2, 0x7e, 0xff, 0x04, 0x27, 0xc1, 0x97, 0xe7, 0xfc, 0xc9, 0xc2,
+	0x9c, 0x9f, 0x5e, 0xf6, 0x4c, 0xc2, 0xff, 0x37, 0x9a, 0xf0, 0xbd, 0x05, 0x09, 0x3f, 0x95, 0xae,
+	0x1f, 0x68, 0xb6, 0xbf, 0x4b, 0x42, 0xda, 0x3f, 0x38, 0xe3, 0x8f, 0x17, 0x65, 0xfc, 0x9d, 0x13,
+	0x1e, 0xbd, 0x5f, 0x9e, 0x75, 0x75, 0x61, 0xd6, 0x97, 0x93, 0x3f, 0x93, 0xf9, 0x5f, 0x44, 0x33,
+	0xff, 0x64, 0x41, 0xe6, 0x4f, 0xad, 0xef, 0x7b, 0x96, 0x7d, 0xbc, 0x1d, 0x7a, 0xbd, 0x58, 0x65,
+	0x42, 0x2f, 0x4c, 0x3d, 0x64, 0xbe, 0x98, 0xf3, 0x74, 0xb1, 0x7b, 0xdc, 0xe1, 0xe2, 0x1c, 0x20,
+	0xff, 0x8c, 0x1b, 0x9c, 0x3d, 0xaf, 0xd2, 0xd9, 0x32, 0x0a, 0x55, 0x45, 0xa9, 0x2a, 0xa3, 0x6b,
+	0xac, 0xc4, 0x36, 0x4b, 0x7b, 0x80, 0xa2, 0x16, 0xb3, 0x73, 0x74, 0xbb, 0x5c, 0x17, 0x95, 0xe8,
+	0x93, 0xdd, 0x05, 0xc0, 0x3e, 0x42, 0x96, 0x54, 0xa5, 0xcd, 0xf3, 0x82, 0xa2, 0xa0, 0x18, 0x3d,
+	0x1b, 0xfb, 0x70, 0xae, 0xbe, 0xc7, 0xed, 0x2b, 0x28, 0x5e, 0xfa, 0x16, 0x43, 0xb1, 0x3d, 0x1e,
+	0x98, 0x5a, 0x57, 0xef, 0xce, 0xb9, 0x05, 0x14, 0x22, 0xb7, 0x80, 0x6f, 0x4d, 0xbd, 0xfd, 0x2e,
+	0xe4, 0x8b, 0xde, 0x06, 0x4a, 0xb3, 0xb7, 0x81, 0xf7, 0x4f, 0x28, 0x69, 0xee, 0xad, 0x60, 0x79,
+	0xfa, 0x56, 0xf0, 0xcd, 0x13, 0xca, 0x9a, 0xba, 0x1d, 0xdc, 0x89, 0xde, 0x0e, 0x6e, 0x9d, 0x50,
+	0xca, 0xcc, 0x2d, 0xe1, 0x4e, 0xf4, 0x96, 0xf0, 0xa4, 0x92, 0x66, 0x6e, 0x0b, 0xff, 0x73, 0xea,
+	0xb6, 0xf0, 0x5f, 0x4e, 0x1a, 0xa2, 0xc9, 0xad, 0xe1, 0xc3, 0xd0, 0x8d, 0x9f, 0x7b, 0x63, 0x78,
+	0xef, 0x84, 0x42, 0xe6, 0xdc, 0xfc, 0xfd, 0x29, 0x16, 0xdc, 0xfc, 0xed, 0x43, 0x26, 0xda, 0xcf,
+	0xfe, 0xfd, 0x54, 0xa5, 0x30, 0xb9, 0xac, 0xd4, 0x9c, 0xbe, 0x4d, 0x26, 0xd2, 0x8a, 0x5f, 0xc7,
+	0x20, 0x3f, 0x85, 0xc4, 0x7b, 0x90, 0x9f, 0xea, 0x38, 0xac, 0xf6, 0x96, 0xbb, 0x98, 0xcb, 0x85,
+	0xdb, 0x0d, 0x7e, 0x1d, 0x56, 0xc6, 0x54, 0x83, 0xd7, 0x31, 0x67, 0x5f, 0x05, 0x5d, 0x74, 0xf1,
+	0xef, 0xb1, 0xf0, 0xf5, 0xcf, 0xd3, 0x59, 0xdf, 0xff, 0xe3, 0xb4, 0xc5, 0xbb, 0xd8, 0xfd, 0x6f,
+	0x66, 0xdc, 0x7f, 0x3c, 0xdf, 0xfd, 0x25, 0xaf, 0x66, 0x96, 0x8b, 0xc0, 0x1f, 0x63, 0xfe, 0x31,
+	0xf5, 0xd1, 0xac, 0xf7, 0xef, 0x9f, 0x66, 0xbb, 0x2d, 0xf6, 0xfc, 0xc7, 0x33, 0x9e, 0xef, 0xce,
+	0xf7, 0x7c, 0x89, 0x63, 0xe4, 0x72, 0x5e, 0xff, 0x25, 0x36, 0x39, 0xaa, 0x3d, 0x9e, 0xf5, 0xfb,
+	0x83, 0xd3, 0x35, 0x88, 0xc5, 0x9e, 0xff, 0x64, 0xc6, 0xf3, 0x47, 0xf3, 0x3d, 0x5f, 0xea, 0x20,
+	0xb5, 0xbc, 0xef, 0xfe, 0x61, 0xe5, 0x9f, 0xf0, 0x3d, 0x3a, 0xe0, 0xbf, 0x3a, 0xdf, 0xe7, 0x1e,
+	0x25, 0x96, 0xf3, 0xfd, 0xf7, 0x31, 0x6f, 0x5c, 0xdf, 0x9b, 0x75, 0xfc, 0xdf, 0x4e, 0xd1, 0x84,
+	0x17, 0x7b, 0xfd, 0xd5, 0x8c, 0xd7, 0xed, 0xf9, 0x5e, 0x9f, 0x7e, 0x9e, 0x5e, 0xce, 0xe5, 0x9f,
+	0xc7, 0x43, 0x33, 0xeb, 0x93, 0x59, 0xb7, 0x3f, 0x3c, 0xe5, 0x67, 0x63, 0xb1, 0xeb, 0xbf, 0x9a,
+	0x71, 0x7d, 0x7f, 0xbe, 0xeb, 0xcb, 0x0d, 0x94, 0x4b, 0xb9, 0x3f, 0x35, 0xdb, 0x25, 0x4e, 0x36,
+	0xdb, 0xdd, 0xfd, 0x2e, 0x09, 0x19, 0xd6, 0x6a, 0x98, 0xa6, 0x0d, 0x38, 0xe7, 0x3e, 0x34, 0xb4,
+	0xf6, 0x9b, 0x82, 0xda, 0x96, 0x2a, 0x42, 0x55, 0x94, 0xd8, 0xf8, 0x75, 0x16, 0xd6, 0x42, 0x98,
+	0x32, 0xa7, 0x08, 0xee, 0xec, 0x15, 0x02, 0x56, 0x84, 0x5d, 0x14, 0x8f, 0x10, 0xb6, 0x04, 0xa5,
+	0x85, 0x12, 0x74, 0x78, 0x8b, 0x70, 0xab, 0xbb, 0x0d, 0x94, 0x8c, 0xc0, 0xd9, 0x03, 0xcb, 0x6e,
+	0x03, 0xad, 0xd0, 0x29, 0x30, 0x04, 0x27, 0x02, 0x2f, 0xef, 0x0a, 0x64, 0x1f, 0xad, 0x46, 0x18,
+	0xaa, 0x1c, 0xdf, 0x92, 0xc9, 0x3e, 0x4a, 0x45, 0x18, 0x82, 0x07, 0x97, 0x34, 0xbe, 0x02, 0x1b,
+	0x21, 0x04, 0x4f, 0x1e, 0xdc, 0x9f, 0x60, 0x33, 0x11, 0x2c, 0xb3, 0xcb, 0x7d, 0xbe, 0xd9, 0x6d,
+	0x20, 0x88, 0x60, 0x99, 0x75, 0x01, 0x36, 0x1b, 0x75, 0xbe, 0xce, 0xa3, 0x1c, 0xbe, 0x0c, 0x17,
+	0x43, 0xb0, 0x9a, 0xc2, 0x4f, 0x94, 0xe5, 0xf1, 0x55, 0x28, 0x86, 0x90, 0x1c, 0x1b, 0x60, 0x65,
+	0xb2, 0xaf, 0xb6, 0x95, 0x72, 0xb3, 0x82, 0x0a, 0x0b, 0xf1, 0x64, 0x4f, 0x11, 0x6b, 0x68, 0x0d,
+	0xa7, 0x21, 0xe9, 0xc5, 0x3d, 0x05, 0x09, 0x37, 0xd8, 0x69, 0x48, 0x7a, 0x11, 0xce, 0x42, 0x6a,
+	0x12, 0xd6, 0x2c, 0xa4, 0x26, 0xb1, 0xcc, 0x41, 0x3a, 0x14, 0xc0, 0x2c, 0xa4, 0x26, 0x51, 0x0b,
+	0xbf, 0x4d, 0xa5, 0xf1, 0x3a, 0xe4, 0xa3, 0xf1, 0x59, 0x87, 0x7c, 0x34, 0x28, 0xeb, 0x90, 0x8f,
+	0x46, 0x82, 0x9a, 0xc3, 0xdc, 0x47, 0x90, 0x9b, 0xf6, 0xb9, 0x18, 0x47, 0xb1, 0xbb, 0x43, 0x48,
+	0xf1, 0x7d, 0x6d, 0x34, 0xd2, 0x07, 0xee, 0x75, 0x36, 0x27, 0x49, 0x42, 0x3d, 0x32, 0xdd, 0x63,
+	0x28, 0xf8, 0x08, 0xa5, 0xc5, 0x95, 0xeb, 0xd4, 0x4b, 0x04, 0x39, 0x1f, 0x56, 0x16, 0x5a, 0x9c,
+	0xfb, 0xbf, 0x79, 0x3e, 0x84, 0xfa, 0x9f, 0x08, 0xb3, 0xf1, 0x1c, 0xbb, 0x19, 0x4f, 0xde, 0xed,
+	0x40, 0xa6, 0xa2, 0x0f, 0x1c, 0x8d, 0x15, 0xf4, 0x3a, 0xe4, 0x2b, 0x42, 0xbd, 0xc5, 0xa9, 0x6d,
+	0xe9, 0xa1, 0x24, 0xef, 0x49, 0xe8, 0x0c, 0x75, 0x5a, 0x92, 0x55, 0x06, 0x75, 0x43, 0x59, 0x55,
+	0x44, 0x14, 0xc7, 0x79, 0xc8, 0x34, 0xc4, 0xba, 0xa0, 0xb4, 0x64, 0x49, 0x40, 0x09, 0x9c, 0x81,
+	0x15, 0xb9, 0xc1, 0xed, 0x70, 0x28, 0x49, 0x95, 0x28, 0x2d, 0xa1, 0xd9, 0x14, 0xa5, 0x9a, 0xea,
+	0xa2, 0x57, 0xee, 0x7e, 0x02, 0x30, 0xd9, 0x4e, 0xd4, 0xad, 0xea, 0x5e, 0xf0, 0xff, 0x5c, 0x21,
+	0x5d, 0x6b, 0x90, 0x6d, 0xd6, 0xb9, 0x56, 0x55, 0x26, 0x0d, 0x55, 0xe0, 0x51, 0x8c, 0xee, 0x8e,
+	0x00, 0xf0, 0x58, 0x68, 0xee, 0xec, 0x13, 0x14, 0xa7, 0x46, 0x06, 0xc0, 0x96, 0xf8, 0xe0, 0x3e,
+	0x4a, 0xdc, 0x3d, 0x00, 0xc4, 0x55, 0x2b, 0xf2, 0xd4, 0xb1, 0x2b, 0x0f, 0x19, 0x49, 0x96, 0xdc,
+	0xf2, 0x70, 0x5f, 0x2f, 0x27, 0xcf, 0x32, 0x6c, 0x2f, 0x4e, 0xbf, 0x8e, 0xb8, 0xf1, 0xf2, 0x9e,
+	0x3a, 0x18, 0x20, 0xe1, 0x06, 0x30, 0x78, 0x19, 0x40, 0xc9, 0xf2, 0xbb, 0x8f, 0xdf, 0xe9, 0x99,
+	0x41, 0x93, 0xd8, 0x32, 0xad, 0xde, 0xbd, 0xd0, 0xff, 0xfe, 0x1a, 0xa3, 0x03, 0x4b, 0xbb, 0xc7,
+	0xfe, 0x51, 0xe6, 0x5e, 0xcf, 0x0c, 0x61, 0x9e, 0xad, 0x32, 0xe0, 0xdb, 0xff, 0x08, 0x00, 0x00,
+	0xff, 0xff, 0xbc, 0xad, 0xf4, 0x6d, 0x2a, 0x2c, 0x00, 0x00,
 }
diff --git a/src/chromite/api/depgraph.proto b/src/chromite/api/depgraph.proto
index ae358ed..bd5f0d2 100644
--- a/src/chromite/api/depgraph.proto
+++ b/src/chromite/api/depgraph.proto
@@ -50,7 +50,8 @@
   // The sysroot whose dependency graph is being created.  If no sysroot is
   // being used, may be unspecified.
   Sysroot sysroot = 4;
-  // TODO(crbug/1081828): drop when no longer used.
+  // TODO(crbug/1081828): drop when all supported release branches are no longer
+  // using this.
   // DEPRECATED: Use sysroot instead.
   // The board whose dependency graph is being created.  If both sysroot and
   // build_target are given, sysroot is used.
diff --git a/src/chromite/api/firmware.proto b/src/chromite/api/firmware.proto
index 8137846..80069a4 100644
--- a/src/chromite/api/firmware.proto
+++ b/src/chromite/api/firmware.proto
@@ -156,7 +156,11 @@
 }
 
 message BundleFirmwareArtifactsRequest {
-  reserved 1;
+  // firmware_location was moved to artifacts.output_artifacts[].location before
+  // chromite started processing it.  We could potentially reuse this number if
+  // we want.
+  // reserved 1;
+  // reserved "firmware_location";
 
   // The chroot where the operations will be executed.
   // Required.
diff --git a/src/chromite/api/sysroot.proto b/src/chromite/api/sysroot.proto
index 24fbc4a..392af61 100644
--- a/src/chromite/api/sysroot.proto
+++ b/src/chromite/api/sysroot.proto
@@ -102,7 +102,9 @@
 
 message InstallPackagesRequest {
   message Flags {
+    // R81 was the last release branch to reference event_file.
     reserved 2;
+    reserved "event_file";
 
     // Compile from source (true), or use bin packages (false).
     bool compile_source = 1;
diff --git a/src/chromite/api/test.proto b/src/chromite/api/test.proto
index dc9dbe3..2a780f3 100644
--- a/src/chromite/api/test.proto
+++ b/src/chromite/api/test.proto
@@ -33,7 +33,9 @@
   // Skipped packages.
   // Deprecated in favor of package_blocklist.
   // Left in place for compatibility for now.
-  // TODO: Change to reserved after 2021-06-01 and recipes have been updated.
+  // TODO(crbug/1126855): Change to reserved after branches R87 and earlier are
+  // no longer supported, and recipes have stopped setting the field.
+  // Last used in R87.  Remove no earlier than 2021-06-01.
   repeated chromiumos.PackageInfo package_blacklist = 5;
   // Packages to be tested.
   // Defaults to all testable packages when none are given.
diff --git a/src/chromite/api/toolchain.proto b/src/chromite/api/toolchain.proto
index dfe0b08..0ed321d 100644
--- a/src/chromite/api/toolchain.proto
+++ b/src/chromite/api/toolchain.proto
@@ -70,6 +70,7 @@
 
 // Response describing which bundles were dumped to the given output directory.
 message BundleToolchainResponse {
+  // In R80 and earlier, artifacts_info had a different type.
   reserved 1;
 
   // The artifacts that added to the output directory.
@@ -160,7 +161,8 @@
   };
 
   // DEPRECATED for recipes: used only by legacy toolchain builders.
-  // See also crbug/1019868.
+  // See also crbug/1019868.  R87 is the last release branch that supports the
+  // legacy toolchain builders.
   // Update Chrome ebuild with most recent unvetted orderfile
   rpc UpdateEbuildWithAFDOArtifacts(VerifyAFDOArtifactsRequest)
     returns (VerifyAFDOArtifactsResponse) {
@@ -170,7 +172,8 @@
   }
 
   // DEPRECATED for recipes: used only by legacy toolchain builders.
-  // See also crbug/1019868.
+  // See also crbug/1019868.  R87 is the last release branch that supports the
+  // legacy toolchain builders.
   // Copy the orderfile from unvetted GS bucket to vetted bucket.
   rpc UploadVettedAFDOArtifacts(VerifyAFDOArtifactsRequest)
     returns (VerifyAFDOArtifactsResponse) {
diff --git a/src/chromiumos/common.proto b/src/chromiumos/common.proto
index 43b15d4..236e322 100644
--- a/src/chromiumos/common.proto
+++ b/src/chromiumos/common.proto
@@ -22,7 +22,9 @@
 // Chroot is used to define how to enter a chroot.
 message Chroot {
   // Deprecated fields.
+  // R80 was the last release branch to use 'goma'.
   reserved 5;
+  reserved "goma";
 
   message ChrootEnv {
     // USE flags to set.
@@ -464,7 +466,9 @@
       // images.
       repeated string gs_locations = 2;
 
+      // R83 was the last release branch to use profile_info.
       reserved 3;
+      reserved "profile_info";
 
       // Any acl to apply, such as "public-read".
       string acl_name = 4;