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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+	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;