diff --git a/api/blob.go b/api/blob.go
index 979f1281..e246d36e 100644
--- a/api/blob.go
+++ b/api/blob.go
@@ -80,8 +80,8 @@ func (s *SigningService) PostSignBlob(ctx context.Context, request *proto.BlobSi
 	var err error
 
 	f := func(statusCode int, err error) {
-		log.Printf(`m=%s,digest=%q,hash=%q,st=%d,et=%d,err="%v"`,
-			methodName, request.GetDigest(), request.HashAlgorithm.String(), statusCode, timeElapsedSince(start), err)
+		log.Printf(`m=%s,digest=%q,hash=%q,st=%d,p=%d,et=%d,err="%v"`,
+			methodName, request.GetDigest(), request.HashAlgorithm.String(), statusCode, request.Priority, timeElapsedSince(start), err)
 	}
 	defer logWithCheckingPanic(f, &statusCode, &err)
 
diff --git a/api/sshhost.go b/api/sshhost.go
index 219d21f6..44316026 100644
--- a/api/sshhost.go
+++ b/api/sshhost.go
@@ -111,8 +111,8 @@ func (s *SigningService) PostHostSSHCertificate(ctx context.Context, request *pr
 		if cert != nil {
 			kid = cert.KeyId
 		}
-		log.Printf(`m=%s,id=%q,principals=%q,st=%d,et=%d,err="%v"`,
-			methodName, kid, request.Principals, statusCode, timeElapsedSince(start), err)
+		log.Printf(`m=%s,id=%q,principals=%q,st=%d,p=%d,et=%d,err="%v"`,
+			methodName, kid, request.Principals, statusCode, request.Priority, timeElapsedSince(start), err)
 	}
 	defer logWithCheckingPanic(f, &statusCode, &err)
 
diff --git a/api/sshuser.go b/api/sshuser.go
index 5dcef38e..56775cfe 100644
--- a/api/sshuser.go
+++ b/api/sshuser.go
@@ -111,8 +111,8 @@ func (s *SigningService) PostUserSSHCertificate(ctx context.Context, request *pr
 		if cert != nil {
 			kid = cert.KeyId
 		}
-		log.Printf(`m=%s,id=%q,principals=%q,st=%d,et=%d,err="%v"`,
-			methodName, kid, request.Principals, statusCode, timeElapsedSince(start), err)
+		log.Printf(`m=%s,id=%q,principals=%q,st=%d,p=%d,et=%d,err="%v"`,
+			methodName, kid, request.Principals, statusCode, request.Priority, timeElapsedSince(start), err)
 	}
 	defer logWithCheckingPanic(f, &statusCode, &err)
 
diff --git a/api/x509cert.go b/api/x509cert.go
index 8bfd0fec..fe07bb95 100644
--- a/api/x509cert.go
+++ b/api/x509cert.go
@@ -104,7 +104,7 @@ func (s *SigningService) PostX509Certificate(ctx context.Context, request *proto
 	var err error
 
 	f := func(statusCode int, err error) {
-		log.Printf(`m=%s,sub=%q,st=%d,et=%d,err="%v"`, methodName, subject, statusCode, timeElapsedSince(start), err)
+		log.Printf(`m=%s,sub=%q,st=%d,p=%d,et=%d,err="%v"`, methodName, subject, statusCode, request.Priority, timeElapsedSince(start), err)
 	}
 	defer logWithCheckingPanic(f, &statusCode, &err)
 
diff --git a/go.mod b/go.mod
index 883947cf..1ede1f01 100644
--- a/go.mod
+++ b/go.mod
@@ -7,9 +7,8 @@ require (
 	github.com/grpc-ecosystem/go-grpc-middleware v1.3.0
 	github.com/grpc-ecosystem/grpc-gateway/v2 v2.4.0
 	github.com/miekg/pkcs11 v1.0.3
-	golang.org/x/crypto v0.0.0-20201221181555-eec23a3978ad
-	golang.org/x/mod v0.4.0 // indirect
-	google.golang.org/genproto v0.0.0-20210426193834-eac7f76ac494
+	golang.org/x/crypto v0.0.0-20210513164829-c07d793c2f9a
+	google.golang.org/genproto v0.0.0-20210607140030-00d4fb20b1ae
 	google.golang.org/grpc v1.38.0
 	google.golang.org/grpc/cmd/protoc-gen-go-grpc v1.1.0
 	google.golang.org/protobuf v1.26.0
diff --git a/go.sum b/go.sum
index fb1042a6..88d53b51 100644
--- a/go.sum
+++ b/go.sum
@@ -276,6 +276,7 @@ github.com/yuin/goldmark v1.1.25/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9de
 github.com/yuin/goldmark v1.1.27/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 github.com/yuin/goldmark v1.1.32/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 github.com/yuin/goldmark v1.2.1/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
+github.com/yuin/goldmark v1.3.5/go.mod h1:mwnBkeHKe2W/ZEtQ+71ViKU8L12m81fl3OWwC1Zlc8k=
 go.etcd.io/bbolt v1.3.2/go.mod h1:IbVyRI1SCnLcuJnV2u8VeU0CEYM7e686BmAb1XKL+uU=
 go.opencensus.io v0.21.0/go.mod h1:mSImk1erAIZhrmZN+AvHh14ztQfjbGwt4TtuofqLduU=
 go.opencensus.io v0.22.0/go.mod h1:+kGneAE2xo2IficOXnaByMWTGM9T73dGwxeWcUqIpI8=
@@ -299,8 +300,8 @@ golang.org/x/crypto v0.0.0-20190510104115-cbcb75029529/go.mod h1:yigFU9vqHzYiE8U
 golang.org/x/crypto v0.0.0-20190605123033-f99c8df09eb5/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
-golang.org/x/crypto v0.0.0-20201221181555-eec23a3978ad h1:DN0cp81fZ3njFcrLCytUHRSUkqBjfTo4Tx9RJTWs0EY=
-golang.org/x/crypto v0.0.0-20201221181555-eec23a3978ad/go.mod h1:jdWPYTVW3xRLrWPugEBEK3UY2ZEsg3UU495nc5E+M+I=
+golang.org/x/crypto v0.0.0-20210513164829-c07d793c2f9a h1:kr2P4QFmQr29mSLA43kwrOcgcReGTfbE9N577tCTuBc=
+golang.org/x/crypto v0.0.0-20210513164829-c07d793c2f9a/go.mod h1:P+XmwS30IXTQdn5tA2iutPOUgjI07+tq3H3K9MVA1s8=
 golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/exp v0.0.0-20190306152737-a1d7652674e8/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/exp v0.0.0-20190510132918-efd6b22b2522/go.mod h1:ZjyILWgesfNpC6sMxTJOJm9Kp84zZh5NQWvqDGG3Qr8=
@@ -324,6 +325,7 @@ golang.org/x/lint v0.0.0-20191125180803-fdd1cda4f05f/go.mod h1:5qLYkcX4OjUUV8bRu
 golang.org/x/lint v0.0.0-20200130185559-910be7a94367/go.mod h1:3xt1FjdF8hUf6vQPIChWIBhFzV8gjjsPE/fR3IyQdNY=
 golang.org/x/lint v0.0.0-20200302205851-738671d3881b/go.mod h1:3xt1FjdF8hUf6vQPIChWIBhFzV8gjjsPE/fR3IyQdNY=
 golang.org/x/lint v0.0.0-20201208152925-83fdc39ff7b5/go.mod h1:3xt1FjdF8hUf6vQPIChWIBhFzV8gjjsPE/fR3IyQdNY=
+golang.org/x/lint v0.0.0-20210508222113-6edffad5e616/go.mod h1:3xt1FjdF8hUf6vQPIChWIBhFzV8gjjsPE/fR3IyQdNY=
 golang.org/x/mobile v0.0.0-20190312151609-d3739f865fa6/go.mod h1:z+o9i4GpDbdi3rU15maQ/Ox0txvL9dWGYEHz965HBQE=
 golang.org/x/mobile v0.0.0-20190719004257-d2bd2a29d028/go.mod h1:E/iHnbuqvinMTCcRqshq8CkpyQDoeVncDDYHnLhea+o=
 golang.org/x/mod v0.0.0-20190513183733-4bf6d317e70e/go.mod h1:mXi4GBBbnImb6dmsKGUJ2LatrhH/nqhxcFungHvyanc=
@@ -332,8 +334,8 @@ golang.org/x/mod v0.1.1-0.20191105210325-c90efee705ee/go.mod h1:QqPTAvyqsEbceGzB
 golang.org/x/mod v0.1.1-0.20191107180719-034126e5016b/go.mod h1:QqPTAvyqsEbceGzBzNggFXnrqF1CaUcvgkdR5Ot7KZg=
 golang.org/x/mod v0.2.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/mod v0.3.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
-golang.org/x/mod v0.4.0 h1:8pl+sMODzuvGJkmj2W4kZihvVb5mKm8pB/X44PIQHv8=
-golang.org/x/mod v0.4.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
+golang.org/x/mod v0.4.2 h1:Gz96sIWK3OalVv/I/qNygP42zyoKp3xptRVCWRFEBvo=
+golang.org/x/mod v0.4.2/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20181023162649-9b4f9f5ad519/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
@@ -367,8 +369,10 @@ golang.org/x/net v0.0.0-20200822124328-c89045814202/go.mod h1:/O7V0waA8r7cgGh81R
 golang.org/x/net v0.0.0-20201021035429-f5854403a974/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
 golang.org/x/net v0.0.0-20201110031124-69a78807bb2b/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
 golang.org/x/net v0.0.0-20210119194325-5f4716e94777/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
-golang.org/x/net v0.0.0-20210316092652-d523dce5a7f4 h1:b0LrWgu8+q7z4J+0Y3Umo5q1dL7NXBkKBWkaVkAq17E=
+golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
 golang.org/x/net v0.0.0-20210316092652-d523dce5a7f4/go.mod h1:RBQZq4jEuRlivfhVLdyRGr576XBO4/greRjx4P4O3yc=
+golang.org/x/net v0.0.0-20210405180319-a5a99cb37ef4 h1:4nGaVu0QrbjT/AK2PRLuQfQuh6DJve+pELhqTdAj3x0=
+golang.org/x/net v0.0.0-20210405180319-a5a99cb37ef4/go.mod h1:p54w0d4576C0XHj96bSt6lcn1PtDYWL6XObtHCRCNQM=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/oauth2 v0.0.0-20190226205417-e64efc72b421/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
 golang.org/x/oauth2 v0.0.0-20190604053449-0f29369cfe45/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
@@ -384,6 +388,7 @@ golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e/go.mod h1:RxMgew5VJxzue5/jJ
 golang.org/x/sync v0.0.0-20200317015054-43a5402ce75a/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20200625203802-6e8e738ad208/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20210220032951-036812b2e83c/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sys v0.0.0-20180823144017-11551d06cbcc/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
@@ -400,7 +405,6 @@ golang.org/x/sys v0.0.0-20190606165138-5da285871e9c/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20190624142023-c5567b49c5d0/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190726091711-fc99dfbffb4e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20191001151750-bb3f8db39f24/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20191026070338-33540a1f6037/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20191204072324-ce4227a45e2e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20191228213918-04cbcbbfeed8/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200113162924-86b910548bc1/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
@@ -421,9 +425,10 @@ golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20210119212857-b64e53b001e4/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210315160823-c6e025ad8005/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20210320140829-1e4c9ba3b0c4 h1:EZ2mChiOa8udjfp6rRmswTbtZN/QzUQp4ptM4rnjHvc=
 golang.org/x/sys v0.0.0-20210320140829-1e4c9ba3b0c4/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/term v0.0.0-20201117132131-f5c789dd3221/go.mod h1:Nr5EML6q2oocZ2LXRh80K7BxOlk5/8JxuGnuhpl+muw=
+golang.org/x/sys v0.0.0-20210330210617-4fbd30eecc44/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210510120138-977fb7262007 h1:gG67DSER+11cZvqIMb8S8bt0vZtiN6xWYARwirrOSfE=
+golang.org/x/sys v0.0.0-20210510120138-977fb7262007/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1 h1:v+OssWQX+hTHEmOBgwxdZxK4zHq3yOs8F9J7mk0PY8E=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
@@ -485,8 +490,9 @@ golang.org/x/tools v0.0.0-20200729194436-6467de6f59a7/go.mod h1:njjCfa9FT2d7l9Bc
 golang.org/x/tools v0.0.0-20200804011535-6c149bb5ef0d/go.mod h1:njjCfa9FT2d7l9Bc6FUM5FLjQPp3cFF28FI3qnDFljA=
 golang.org/x/tools v0.0.0-20200825202427-b303f430e36d/go.mod h1:njjCfa9FT2d7l9Bc6FUM5FLjQPp3cFF28FI3qnDFljA=
 golang.org/x/tools v0.0.0-20210106214847-113979e3529a/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
-golang.org/x/tools v0.1.0 h1:po9/4sTYwZU9lPhi1tOrb4hCv3qrhiQ77LZfGa2OjwY=
 golang.org/x/tools v0.1.0/go.mod h1:xkSsbof2nBLbhDlRMhhhyNLN/zl3eTqcnHD5viDpcZ0=
+golang.org/x/tools v0.1.2 h1:kRBLX7v7Af8W7Gdbbc908OJcdgtK8bOz9Uaj8/F1ACA=
+golang.org/x/tools v0.1.2/go.mod h1:o0xws9oXOQQZyjljx8fwUC0k7L1pTE6eaCbjGeHmOkk=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
@@ -545,8 +551,9 @@ google.golang.org/genproto v0.0.0-20200729003335-053ba62fc06f/go.mod h1:FWY/as6D
 google.golang.org/genproto v0.0.0-20200804131852-c06518451d9c/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
 google.golang.org/genproto v0.0.0-20200825200019-8632dd797987/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
 google.golang.org/genproto v0.0.0-20210207032614-bba0dbe2a9ea/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
-google.golang.org/genproto v0.0.0-20210426193834-eac7f76ac494 h1:KMgpo2lWy1vfrYjtxPAzR0aNWeAR1UdQykt6sj/hpBY=
 google.golang.org/genproto v0.0.0-20210426193834-eac7f76ac494/go.mod h1:P3QM42oQyzQSnHPnZ/vqoCdDmzH28fzWByN9asMeM8A=
+google.golang.org/genproto v0.0.0-20210607140030-00d4fb20b1ae h1:2dB4bZ/B7RJdKuvHk3mKTzL2xwrikb+Y/QQy7WdyBPk=
+google.golang.org/genproto v0.0.0-20210607140030-00d4fb20b1ae/go.mod h1:UODoCrxHCcBojKKwX1terBiRUaqAsFqJiF615XL43r0=
 google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
 google.golang.org/grpc v1.20.1/go.mod h1:10oTOabMzJvdu6/UiuZezV6QK5dSlG84ov/aaiqXj38=
 google.golang.org/grpc v1.21.1/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM=
diff --git a/proto/protogen.go b/proto/protogen.go
index 9bf8b67f..37431c42 100644
--- a/proto/protogen.go
+++ b/proto/protogen.go
@@ -4,7 +4,7 @@
 // Package proto contains proto generated code.
 package proto
 
-// use protoc 3.17.0
+// use protoc 3.17.2
 //go:generate protoc -I. -I../third_party/googleapis --go_out=paths=source_relative:. --go-grpc_out=paths=source_relative:. sign.proto
 //go:generate protoc -I. -I../third_party/googleapis --grpc-gateway_out=paths=source_relative:. --grpc-gateway_opt logtostderr=true --grpc-gateway_opt paths=source_relative --grpc-gateway_opt generate_unbound_methods=true sign.proto
 //go:generate mockgen -source=./sign_grpc.pb.go -destination=./mock/mock.go -package=mock
diff --git a/proto/sign.pb.go b/proto/sign.pb.go
index 95900cc9..539a4280 100644
--- a/proto/sign.pb.go
+++ b/proto/sign.pb.go
@@ -3,8 +3,8 @@
 
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.26.0
-// 	protoc        v3.17.0
+// 	protoc-gen-go v1.26.0-devel
+// 	protoc        v3.17.2
 // source: sign.proto
 
 package proto
@@ -80,6 +80,58 @@ func (HashAlgo) EnumDescriptor() ([]byte, []int) {
 	return file_sign_proto_rawDescGZIP(), []int{0}
 }
 
+type Priority int32
+
+const (
+	Priority_Unspecified_priority Priority = 0
+	Priority_Low                  Priority = 1
+	Priority_Medium               Priority = 2
+	Priority_High                 Priority = 3
+)
+
+// Enum value maps for Priority.
+var (
+	Priority_name = map[int32]string{
+		0: "Unspecified_priority",
+		1: "Low",
+		2: "Medium",
+		3: "High",
+	}
+	Priority_value = map[string]int32{
+		"Unspecified_priority": 0,
+		"Low":                  1,
+		"Medium":               2,
+		"High":                 3,
+	}
+)
+
+func (x Priority) Enum() *Priority {
+	p := new(Priority)
+	*p = x
+	return p
+}
+
+func (x Priority) String() string {
+	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
+}
+
+func (Priority) Descriptor() protoreflect.EnumDescriptor {
+	return file_sign_proto_enumTypes[1].Descriptor()
+}
+
+func (Priority) Type() protoreflect.EnumType {
+	return &file_sign_proto_enumTypes[1]
+}
+
+func (x Priority) Number() protoreflect.EnumNumber {
+	return protoreflect.EnumNumber(x)
+}
+
+// Deprecated: Use Priority.Descriptor instead.
+func (Priority) EnumDescriptor() ([]byte, []int) {
+	return file_sign_proto_rawDescGZIP(), []int{1}
+}
+
 // KeyMeta identifies the private key used in crypto operations.
 type KeyMeta struct {
 	state         protoimpl.MessageState
@@ -197,6 +249,11 @@ type SSHCertificateSigningRequest struct {
 	CriticalOptions map[string]string `protobuf:"bytes,6,rep,name=critical_options,json=criticalOptions,proto3" json:"critical_options,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
 	// Extensions field in the certificate.
 	Extensions map[string]string `protobuf:"bytes,7,rep,name=extensions,proto3" json:"extensions,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	// Priority of the request as specified by client. If the server is under heavy load, it may
+	// decide to process higher priority requests before the lower priority requests.
+	// This feature is currently EXPERIMENTAL where priority value is only logged and not used for anything else.
+	// Specific implementation will be based on analysis of client request patterns.
+	Priority Priority `protobuf:"varint,10,opt,name=priority,proto3,enum=v3.Priority" json:"priority,omitempty"`
 }
 
 func (x *SSHCertificateSigningRequest) Reset() {
@@ -280,6 +337,13 @@ func (x *SSHCertificateSigningRequest) GetExtensions() map[string]string {
 	return nil
 }
 
+func (x *SSHCertificateSigningRequest) GetPriority() Priority {
+	if x != nil {
+		return x.Priority
+	}
+	return Priority_Unspecified_priority
+}
+
 // SSHKey specifies an SSH key that can either be an:
 // 1. SSH public key, or
 // 2. SSH user/host certificate
@@ -346,6 +410,11 @@ type X509CertificateSigningRequest struct {
 	// X509 certificate ExtKeyUsage.
 	// https://godoc.org/crypto/x509#ExtKeyUsage
 	ExtKeyUsage []int32 `protobuf:"varint,4,rep,packed,name=ext_key_usage,json=extKeyUsage,proto3" json:"ext_key_usage,omitempty"`
+	// Priority of the request as specified by client. If the server is under heavy load, it may
+	// decide to process higher priority requests before the lower priority requests.
+	// This feature is currently EXPERIMENTAL where priority value is only logged and not used for anything else.
+	// Specific implementation will be based on analysis of client request patterns.
+	Priority Priority `protobuf:"varint,10,opt,name=priority,proto3,enum=v3.Priority" json:"priority,omitempty"`
 }
 
 func (x *X509CertificateSigningRequest) Reset() {
@@ -408,6 +477,13 @@ func (x *X509CertificateSigningRequest) GetExtKeyUsage() []int32 {
 	return nil
 }
 
+func (x *X509CertificateSigningRequest) GetPriority() Priority {
+	if x != nil {
+		return x.Priority
+	}
+	return Priority_Unspecified_priority
+}
+
 // X509Certificate specifies an X509 certificate.
 type X509Certificate struct {
 	state         protoimpl.MessageState
@@ -518,6 +594,11 @@ type BlobSigningRequest struct {
 	// the algorithm of hash function used to generate the digest
 	// https://golang.org/pkg/crypto/#Hash.
 	HashAlgorithm HashAlgo `protobuf:"varint,3,opt,name=hash_algorithm,json=hashAlgorithm,proto3,enum=v3.HashAlgo" json:"hash_algorithm,omitempty"`
+	// Priority of the request as specified by client. If the server is under heavy load, it may
+	// decide to process higher priority requests before the lower priority requests.
+	// This feature is currently EXPERIMENTAL where priority value is only logged and not used for anything else.
+	// Specific implementation will be based on analysis of client request patterns.
+	Priority Priority `protobuf:"varint,10,opt,name=priority,proto3,enum=v3.Priority" json:"priority,omitempty"`
 }
 
 func (x *BlobSigningRequest) Reset() {
@@ -573,6 +654,13 @@ func (x *BlobSigningRequest) GetHashAlgorithm() HashAlgo {
 	return HashAlgo_Unspecified_Hash
 }
 
+func (x *BlobSigningRequest) GetPriority() Priority {
+	if x != nil {
+		return x.Priority
+	}
+	return Priority_Unspecified_priority
+}
+
 // Signature is a base64 encoded result of signing a blob.
 type Signature struct {
 	state         protoimpl.MessageState
@@ -634,7 +722,7 @@ var file_sign_proto_rawDesc = []byte{
 	0x74, 0x69, 0x66, 0x69, 0x65, 0x72, 0x22, 0x2b, 0x0a, 0x08, 0x4b, 0x65, 0x79, 0x4d, 0x65, 0x74,
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+	0x65, 0x79, 0x73, 0x22, 0x99, 0x04, 0x0a, 0x1c, 0x53, 0x53, 0x48, 0x43, 0x65, 0x72, 0x74, 0x69,
 	0x66, 0x69, 0x63, 0x61, 0x74, 0x65, 0x53, 0x69, 0x67, 0x6e, 0x69, 0x6e, 0x67, 0x52, 0x65, 0x71,
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@@ -657,136 +745,149 @@ var file_sign_proto_rawDesc = []byte{
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 }
 
 var (
@@ -801,60 +902,64 @@ func file_sign_proto_rawDescGZIP() []byte {
 	return file_sign_proto_rawDescData
 }
 
-var file_sign_proto_enumTypes = make([]protoimpl.EnumInfo, 1)
+var file_sign_proto_enumTypes = make([]protoimpl.EnumInfo, 2)
 var file_sign_proto_msgTypes = make([]protoimpl.MessageInfo, 11)
 var file_sign_proto_goTypes = []interface{}{
 	(HashAlgo)(0),                         // 0: v3.HashAlgo
-	(*KeyMeta)(nil),                       // 1: v3.KeyMeta
-	(*KeyMetas)(nil),                      // 2: v3.KeyMetas
-	(*SSHCertificateSigningRequest)(nil),  // 3: v3.SSHCertificateSigningRequest
-	(*SSHKey)(nil),                        // 4: v3.SSHKey
-	(*X509CertificateSigningRequest)(nil), // 5: v3.X509CertificateSigningRequest
-	(*X509Certificate)(nil),               // 6: v3.X509Certificate
-	(*PublicKey)(nil),                     // 7: v3.PublicKey
-	(*BlobSigningRequest)(nil),            // 8: v3.BlobSigningRequest
-	(*Signature)(nil),                     // 9: v3.Signature
-	nil,                                   // 10: v3.SSHCertificateSigningRequest.CriticalOptionsEntry
-	nil,                                   // 11: v3.SSHCertificateSigningRequest.ExtensionsEntry
-	(*emptypb.Empty)(nil),                 // 12: google.protobuf.Empty
+	(Priority)(0),                         // 1: v3.Priority
+	(*KeyMeta)(nil),                       // 2: v3.KeyMeta
+	(*KeyMetas)(nil),                      // 3: v3.KeyMetas
+	(*SSHCertificateSigningRequest)(nil),  // 4: v3.SSHCertificateSigningRequest
+	(*SSHKey)(nil),                        // 5: v3.SSHKey
+	(*X509CertificateSigningRequest)(nil), // 6: v3.X509CertificateSigningRequest
+	(*X509Certificate)(nil),               // 7: v3.X509Certificate
+	(*PublicKey)(nil),                     // 8: v3.PublicKey
+	(*BlobSigningRequest)(nil),            // 9: v3.BlobSigningRequest
+	(*Signature)(nil),                     // 10: v3.Signature
+	nil,                                   // 11: v3.SSHCertificateSigningRequest.CriticalOptionsEntry
+	nil,                                   // 12: v3.SSHCertificateSigningRequest.ExtensionsEntry
+	(*emptypb.Empty)(nil),                 // 13: google.protobuf.Empty
 }
 var file_sign_proto_depIdxs = []int32{
-	1,  // 0: v3.KeyMetas.keys:type_name -> v3.KeyMeta
-	1,  // 1: v3.SSHCertificateSigningRequest.key_meta:type_name -> v3.KeyMeta
-	10, // 2: v3.SSHCertificateSigningRequest.critical_options:type_name -> v3.SSHCertificateSigningRequest.CriticalOptionsEntry
-	11, // 3: v3.SSHCertificateSigningRequest.extensions:type_name -> v3.SSHCertificateSigningRequest.ExtensionsEntry
-	1,  // 4: v3.X509CertificateSigningRequest.key_meta:type_name -> v3.KeyMeta
-	1,  // 5: v3.BlobSigningRequest.key_meta:type_name -> v3.KeyMeta
-	0,  // 6: v3.BlobSigningRequest.hash_algorithm:type_name -> v3.HashAlgo
-	12, // 7: v3.Signing.GetX509CertificateAvailableSigningKeys:input_type -> google.protobuf.Empty
-	1,  // 8: v3.Signing.GetX509CACertificate:input_type -> v3.KeyMeta
-	5,  // 9: v3.Signing.PostX509Certificate:input_type -> v3.X509CertificateSigningRequest
-	12, // 10: v3.Signing.GetUserSSHCertificateAvailableSigningKeys:input_type -> google.protobuf.Empty
-	1,  // 11: v3.Signing.GetUserSSHCertificateSigningKey:input_type -> v3.KeyMeta
-	3,  // 12: v3.Signing.PostUserSSHCertificate:input_type -> v3.SSHCertificateSigningRequest
-	12, // 13: v3.Signing.GetHostSSHCertificateAvailableSigningKeys:input_type -> google.protobuf.Empty
-	1,  // 14: v3.Signing.GetHostSSHCertificateSigningKey:input_type -> v3.KeyMeta
-	3,  // 15: v3.Signing.PostHostSSHCertificate:input_type -> v3.SSHCertificateSigningRequest
-	12, // 16: v3.Signing.GetBlobAvailableSigningKeys:input_type -> google.protobuf.Empty
-	1,  // 17: v3.Signing.GetBlobSigningKey:input_type -> v3.KeyMeta
-	8,  // 18: v3.Signing.PostSignBlob:input_type -> v3.BlobSigningRequest
-	2,  // 19: v3.Signing.GetX509CertificateAvailableSigningKeys:output_type -> v3.KeyMetas
-	6,  // 20: v3.Signing.GetX509CACertificate:output_type -> v3.X509Certificate
-	6,  // 21: v3.Signing.PostX509Certificate:output_type -> v3.X509Certificate
-	2,  // 22: v3.Signing.GetUserSSHCertificateAvailableSigningKeys:output_type -> v3.KeyMetas
-	4,  // 23: v3.Signing.GetUserSSHCertificateSigningKey:output_type -> v3.SSHKey
-	4,  // 24: v3.Signing.PostUserSSHCertificate:output_type -> v3.SSHKey
-	2,  // 25: v3.Signing.GetHostSSHCertificateAvailableSigningKeys:output_type -> v3.KeyMetas
-	4,  // 26: v3.Signing.GetHostSSHCertificateSigningKey:output_type -> v3.SSHKey
-	4,  // 27: v3.Signing.PostHostSSHCertificate:output_type -> v3.SSHKey
-	2,  // 28: v3.Signing.GetBlobAvailableSigningKeys:output_type -> v3.KeyMetas
-	7,  // 29: v3.Signing.GetBlobSigningKey:output_type -> v3.PublicKey
-	9,  // 30: v3.Signing.PostSignBlob:output_type -> v3.Signature
-	19, // [19:31] is the sub-list for method output_type
-	7,  // [7:19] is the sub-list for method input_type
-	7,  // [7:7] is the sub-list for extension type_name
-	7,  // [7:7] is the sub-list for extension extendee
-	0,  // [0:7] is the sub-list for field type_name
+	2,  // 0: v3.KeyMetas.keys:type_name -> v3.KeyMeta
+	2,  // 1: v3.SSHCertificateSigningRequest.key_meta:type_name -> v3.KeyMeta
+	11, // 2: v3.SSHCertificateSigningRequest.critical_options:type_name -> v3.SSHCertificateSigningRequest.CriticalOptionsEntry
+	12, // 3: v3.SSHCertificateSigningRequest.extensions:type_name -> v3.SSHCertificateSigningRequest.ExtensionsEntry
+	1,  // 4: v3.SSHCertificateSigningRequest.priority:type_name -> v3.Priority
+	2,  // 5: v3.X509CertificateSigningRequest.key_meta:type_name -> v3.KeyMeta
+	1,  // 6: v3.X509CertificateSigningRequest.priority:type_name -> v3.Priority
+	2,  // 7: v3.BlobSigningRequest.key_meta:type_name -> v3.KeyMeta
+	0,  // 8: v3.BlobSigningRequest.hash_algorithm:type_name -> v3.HashAlgo
+	1,  // 9: v3.BlobSigningRequest.priority:type_name -> v3.Priority
+	13, // 10: v3.Signing.GetX509CertificateAvailableSigningKeys:input_type -> google.protobuf.Empty
+	2,  // 11: v3.Signing.GetX509CACertificate:input_type -> v3.KeyMeta
+	6,  // 12: v3.Signing.PostX509Certificate:input_type -> v3.X509CertificateSigningRequest
+	13, // 13: v3.Signing.GetUserSSHCertificateAvailableSigningKeys:input_type -> google.protobuf.Empty
+	2,  // 14: v3.Signing.GetUserSSHCertificateSigningKey:input_type -> v3.KeyMeta
+	4,  // 15: v3.Signing.PostUserSSHCertificate:input_type -> v3.SSHCertificateSigningRequest
+	13, // 16: v3.Signing.GetHostSSHCertificateAvailableSigningKeys:input_type -> google.protobuf.Empty
+	2,  // 17: v3.Signing.GetHostSSHCertificateSigningKey:input_type -> v3.KeyMeta
+	4,  // 18: v3.Signing.PostHostSSHCertificate:input_type -> v3.SSHCertificateSigningRequest
+	13, // 19: v3.Signing.GetBlobAvailableSigningKeys:input_type -> google.protobuf.Empty
+	2,  // 20: v3.Signing.GetBlobSigningKey:input_type -> v3.KeyMeta
+	9,  // 21: v3.Signing.PostSignBlob:input_type -> v3.BlobSigningRequest
+	3,  // 22: v3.Signing.GetX509CertificateAvailableSigningKeys:output_type -> v3.KeyMetas
+	7,  // 23: v3.Signing.GetX509CACertificate:output_type -> v3.X509Certificate
+	7,  // 24: v3.Signing.PostX509Certificate:output_type -> v3.X509Certificate
+	3,  // 25: v3.Signing.GetUserSSHCertificateAvailableSigningKeys:output_type -> v3.KeyMetas
+	5,  // 26: v3.Signing.GetUserSSHCertificateSigningKey:output_type -> v3.SSHKey
+	5,  // 27: v3.Signing.PostUserSSHCertificate:output_type -> v3.SSHKey
+	3,  // 28: v3.Signing.GetHostSSHCertificateAvailableSigningKeys:output_type -> v3.KeyMetas
+	5,  // 29: v3.Signing.GetHostSSHCertificateSigningKey:output_type -> v3.SSHKey
+	5,  // 30: v3.Signing.PostHostSSHCertificate:output_type -> v3.SSHKey
+	3,  // 31: v3.Signing.GetBlobAvailableSigningKeys:output_type -> v3.KeyMetas
+	8,  // 32: v3.Signing.GetBlobSigningKey:output_type -> v3.PublicKey
+	10, // 33: v3.Signing.PostSignBlob:output_type -> v3.Signature
+	22, // [22:34] is the sub-list for method output_type
+	10, // [10:22] is the sub-list for method input_type
+	10, // [10:10] is the sub-list for extension type_name
+	10, // [10:10] is the sub-list for extension extendee
+	0,  // [0:10] is the sub-list for field type_name
 }
 
 func init() { file_sign_proto_init() }
@@ -977,7 +1082,7 @@ func file_sign_proto_init() {
 		File: protoimpl.DescBuilder{
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_sign_proto_rawDesc,
-			NumEnums:      1,
+			NumEnums:      2,
 			NumMessages:   11,
 			NumExtensions: 0,
 			NumServices:   1,
diff --git a/proto/sign.proto b/proto/sign.proto
index 36acbbb3..947c3e06 100644
--- a/proto/sign.proto
+++ b/proto/sign.proto
@@ -20,6 +20,23 @@ message KeyMetas {
     repeated KeyMeta keys = 1;
 }
 
+
+enum HashAlgo {
+    Unspecified_Hash = 0;
+    SHA224 = 1;
+    SHA256 = 2;
+    SHA384 = 3;
+    SHA512 = 4;
+}
+
+
+enum Priority {
+  Unspecified_priority = 0;
+  Low = 1;
+  Medium = 2;
+  High = 3;
+}
+
 // SSHCertificateSigningRequest specifies the info used for signing an SSH certificate.
 message SSHCertificateSigningRequest {
     // Identifies the signing key in the HSM used for signing the certificate.
@@ -36,6 +53,11 @@ message SSHCertificateSigningRequest {
     map<string, string> critical_options = 6;
     // Extensions field in the certificate.
     map<string, string> extensions = 7;
+    // Priority of the request as specified by client. If the server is under heavy load, it may
+    // decide to process higher priority requests before the lower priority requests.
+    // This feature is currently EXPERIMENTAL where priority value is only logged and not used for anything else. 
+    // Specific implementation will be based on analysis of client request patterns.
+    Priority priority = 10;
 }
 
 // SSHKey specifies an SSH key that can either be an:
@@ -57,6 +79,11 @@ message X509CertificateSigningRequest {
     // X509 certificate ExtKeyUsage.
     // https://godoc.org/crypto/x509#ExtKeyUsage
     repeated int32 ext_key_usage = 4;
+    // Priority of the request as specified by client. If the server is under heavy load, it may
+    // decide to process higher priority requests before the lower priority requests.
+    // This feature is currently EXPERIMENTAL where priority value is only logged and not used for anything else. 
+    // Specific implementation will be based on analysis of client request patterns.
+    Priority priority = 10;
 }
 
 // X509Certificate specifies an X509 certificate.
@@ -71,14 +98,6 @@ message PublicKey {
     string key = 1;
 }
 
-enum HashAlgo {
-    Unspecified_Hash = 0;
-    SHA224 = 1;
-    SHA256 = 2;
-    SHA384 = 3;
-    SHA512 = 4;
-}
-
 message BlobSigningRequest {
     // Identifies the signing key in the PKCS#11 device used for signing the blob.
     KeyMeta key_meta = 1;
@@ -87,6 +106,11 @@ message BlobSigningRequest {
     // the algorithm of hash function used to generate the digest  
     // https://golang.org/pkg/crypto/#Hash.
     HashAlgo hash_algorithm = 3;
+    // Priority of the request as specified by client. If the server is under heavy load, it may
+    // decide to process higher priority requests before the lower priority requests.
+    // This feature is currently EXPERIMENTAL where priority value is only logged and not used for anything else. 
+    // Specific implementation will be based on analysis of client request patterns.
+    Priority priority = 10;
 }
 
 // Signature is a base64 encoded result of signing a blob.