Support lazy failovers in `praefect dataloss`

With the recent failover changes, the output of `praefect dataloss`
is no longer accurate. Previously a repository would have been in
read-only mode if the primary of the repository was outdated. With
lazy failovers in place, it's no longer sufficient to check only
whether the current primary is outdated or not. If the current primary
is outdated, Praefect would immediately switch the repository's primary
on the next request if there is an up to date replica available. This
also means that there is no 'read-only mode' anymore, as we'd simply
failover to an up to date node rather than wait for the current primary
to be brought up to speed. This commit updates the dataloss sub-command
to take the new changes into account:

1. If there is an up to date, available replica for the repository, it's
   considered to be available for both reads and writes.
2. If there are no up to date replicas available, the repository is considered
   unavailable. As it is, Praefect does not distribute writes to outdated
   replicas.
3. To make it easier to determine why a repository is unavailable, 'unavailable'
   is printed next to the storages which are considered to be unavailable by the
   consensus of the Praefect nodes.

Changelog: changed

3 files changed, 137 insertions, 115 deletions

diff --git a/proto/go/gitalypb/praefect.pb.go b/proto/go/gitalypb/praefect.pb.go
index b1ee17d2a..3049f8b73 100644
--- a/proto/go/gitalypb/praefect.pb.go
+++ b/proto/go/gitalypb/praefect.pb.go
@@ -243,10 +243,8 @@ type DatalossCheckRequest struct {
 	unknownFields protoimpl.UnknownFields
 
 	VirtualStorage string `protobuf:"bytes,1,opt,name=virtual_storage,json=virtualStorage,proto3" json:"virtual_storage,omitempty"`
-	// include_partially_replicated decides whether to include repositories which are fully up to date
-	// on the primary but are outdated on some secondaries. Such repositories are still writable and do
-	// not suffer from data loss. The data on the primary is not fully replicated which increases the
-	// chances of data loss following a failover.
+	// include_partially_unavailable indicates whether to include repositories which are available but
+	// are unavailable on some assigned storages.
 	IncludePartiallyReplicated bool `protobuf:"varint,2,opt,name=include_partially_replicated,json=includePartiallyReplicated,proto3" json:"include_partially_replicated,omitempty"`
 }
 
@@ -624,8 +622,8 @@ type DatalossCheckResponse_Repository struct {
 	RelativePath string `protobuf:"bytes,1,opt,name=relative_path,json=relativePath,proto3" json:"relative_path,omitempty"`
 	// storages on which the repository is outdated
 	Storages []*DatalossCheckResponse_Repository_Storage `protobuf:"bytes,2,rep,name=storages,proto3" json:"storages,omitempty"`
-	// read_only indicates whether the repository is in read-only mode.
-	ReadOnly bool `protobuf:"varint,3,opt,name=read_only,json=readOnly,proto3" json:"read_only,omitempty"`
+	// unavailable indicates whether the repository is in unavailable.
+	Unavailable bool `protobuf:"varint,3,opt,name=unavailable,proto3" json:"unavailable,omitempty"`
 	// current primary storage of the repository
 	Primary string `protobuf:"bytes,4,opt,name=primary,proto3" json:"primary,omitempty"`
 }
@@ -676,9 +674,9 @@ func (x *DatalossCheckResponse_Repository) GetStorages() []*DatalossCheckRespons
 	return nil
 }
 
-func (x *DatalossCheckResponse_Repository) GetReadOnly() bool {
+func (x *DatalossCheckResponse_Repository) GetUnavailable() bool {
 	if x != nil {
-		return x.ReadOnly
+		return x.Unavailable
 	}
 	return false
 }
@@ -701,6 +699,10 @@ type DatalossCheckResponse_Repository_Storage struct {
 	BehindBy int64 `protobuf:"varint,2,opt,name=behind_by,json=behindBy,proto3" json:"behind_by,omitempty"`
 	// assigned indicates whether the storage is assigned to host the repository.
 	Assigned bool `protobuf:"varint,3,opt,name=assigned,proto3" json:"assigned,omitempty"`
+	// healthy indicates whether the storage is considered healthy by the consensus of Praefect nodes.
+	Healthy bool `protobuf:"varint,4,opt,name=healthy,proto3" json:"healthy,omitempty"`
+	// valid_primary indicates whether the storage is ready to act as the primary if necessary.
+	ValidPrimary bool `protobuf:"varint,5,opt,name=valid_primary,json=validPrimary,proto3" json:"valid_primary,omitempty"`
 }
 
 func (x *DatalossCheckResponse_Repository_Storage) Reset() {
@@ -756,6 +758,20 @@ func (x *DatalossCheckResponse_Repository_Storage) GetAssigned() bool {
 	return false
 }
 
+func (x *DatalossCheckResponse_Repository_Storage) GetHealthy() bool {
+	if x != nil {
+		return x.Healthy
+	}
+	return false
+}
+
+func (x *DatalossCheckResponse_Repository_Storage) GetValidPrimary() bool {
+	if x != nil {
+		return x.ValidPrimary
+	}
+	return false
+}
+
 type RepositoryReplicasResponse_RepositoryDetails struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
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-	0x97, 0x28, 0x01, 0x42, 0x34, 0x5a, 0x32, 0x67, 0x69, 0x74, 0x6c, 0x61, 0x62, 0x2e, 0x63, 0x6f,
-	0x6d, 0x2f, 0x67, 0x69, 0x74, 0x6c, 0x61, 0x62, 0x2d, 0x6f, 0x72, 0x67, 0x2f, 0x67, 0x69, 0x74,
-	0x61, 0x6c, 0x79, 0x2f, 0x76, 0x31, 0x34, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x2f, 0x67, 0x6f,
-	0x2f, 0x67, 0x69, 0x74, 0x61, 0x6c, 0x79, 0x70, 0x62, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f,
-	0x33,
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+	0x69, 0x74, 0x61, 0x6c, 0x79, 0x2e, 0x53, 0x65, 0x74, 0x52, 0x65, 0x70, 0x6c, 0x69, 0x63, 0x61,
+	0x74, 0x69, 0x6f, 0x6e, 0x46, 0x61, 0x63, 0x74, 0x6f, 0x72, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e,
+	0x73, 0x65, 0x1a, 0x04, 0xf0, 0x97, 0x28, 0x01, 0x42, 0x34, 0x5a, 0x32, 0x67, 0x69, 0x74, 0x6c,
+	0x61, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x67, 0x69, 0x74, 0x6c, 0x61, 0x62, 0x2d, 0x6f, 0x72,
+	0x67, 0x2f, 0x67, 0x69, 0x74, 0x61, 0x6c, 0x79, 0x2f, 0x76, 0x31, 0x34, 0x2f, 0x70, 0x72, 0x6f,
+	0x74, 0x6f, 0x2f, 0x67, 0x6f, 0x2f, 0x67, 0x69, 0x74, 0x61, 0x6c, 0x79, 0x70, 0x62, 0x62, 0x06,
+	0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
diff --git a/proto/go/gitalypb/praefect_grpc.pb.go b/proto/go/gitalypb/praefect_grpc.pb.go
index 435f2e849..5abdde92d 100644
--- a/proto/go/gitalypb/praefect_grpc.pb.go
+++ b/proto/go/gitalypb/praefect_grpc.pb.go
@@ -24,7 +24,7 @@ type PraefectInfoServiceClient interface {
 	// back indicating which repos are consistent with the primary and which ones
 	// need repair.
 	ConsistencyCheck(ctx context.Context, in *ConsistencyCheckRequest, opts ...grpc.CallOption) (PraefectInfoService_ConsistencyCheckClient, error)
-	// DatalossCheck checks for outdated repository replicas.
+	// DatalossCheck checks for unavailable repositories.
 	DatalossCheck(ctx context.Context, in *DatalossCheckRequest, opts ...grpc.CallOption) (*DatalossCheckResponse, error)
 	// SetAuthoritativeStorage sets the authoritative storage for a repository on a given virtual storage.
 	// This causes the current version of the repository on the authoritative storage to be considered the
@@ -127,7 +127,7 @@ type PraefectInfoServiceServer interface {
 	// back indicating which repos are consistent with the primary and which ones
 	// need repair.
 	ConsistencyCheck(*ConsistencyCheckRequest, PraefectInfoService_ConsistencyCheckServer) error
-	// DatalossCheck checks for outdated repository replicas.
+	// DatalossCheck checks for unavailable repositories.
 	DatalossCheck(context.Context, *DatalossCheckRequest) (*DatalossCheckResponse, error)
 	// SetAuthoritativeStorage sets the authoritative storage for a repository on a given virtual storage.
 	// This causes the current version of the repository on the authoritative storage to be considered the
diff --git a/proto/praefect.proto b/proto/praefect.proto
index 946fef596..71198a687 100644
--- a/proto/praefect.proto
+++ b/proto/praefect.proto
@@ -17,7 +17,7 @@ service PraefectInfoService {
   // need repair.
   rpc ConsistencyCheck(ConsistencyCheckRequest) returns (stream ConsistencyCheckResponse);
 
-  // DatalossCheck checks for outdated repository replicas.
+  // DatalossCheck checks for unavailable repositories.
   rpc DatalossCheck(DatalossCheckRequest) returns (DatalossCheckResponse);
 
   // SetAuthoritativeStorage sets the authoritative storage for a repository on a given virtual storage.
@@ -62,10 +62,8 @@ message SetAuthoritativeStorageResponse {}
 
 message DatalossCheckRequest {
   string virtual_storage = 1;
-  // include_partially_replicated decides whether to include repositories which are fully up to date
-  // on the primary but are outdated on some secondaries. Such repositories are still writable and do
-  // not suffer from data loss. The data on the primary is not fully replicated which increases the
-  // chances of data loss following a failover.
+  // include_partially_unavailable indicates whether to include repositories which are available but
+  // are unavailable on some assigned storages.
   bool include_partially_replicated = 2;
 }
 
@@ -78,14 +76,18 @@ message DatalossCheckResponse {
       int64 behind_by = 2;
       // assigned indicates whether the storage is assigned to host the repository.
       bool assigned = 3;
+      // healthy indicates whether the storage is considered healthy by the consensus of Praefect nodes.
+      bool healthy = 4;
+      // valid_primary indicates whether the storage is ready to act as the primary if necessary.
+      bool valid_primary = 5;
     }
 
     // relative path of the repository with outdated replicas
     string relative_path = 1;
     // storages on which the repository is outdated
     repeated Storage storages = 2;
-    // read_only indicates whether the repository is in read-only mode.
-    bool read_only = 3;
+    // unavailable indicates whether the repository is in unavailable.
+    bool unavailable = 3;
 
     // current primary storage of the repository
     string primary = 4;