diff --git a/proto-docs/object.md b/proto-docs/object.md
index 57d0d56..ce9252b 100644
--- a/proto-docs/object.md
+++ b/proto-docs/object.md
@@ -112,8 +112,7 @@ headers are also present.
 
 Search objects in container. Version of query language format SHOULD BE
 set to 1. Search query represented in serialized format (see query
-package). Requested list can be restored by concatenation of addresses
-from all messages. Addresses from resulting list are expected to be unique.
+package).
 
 | Name | Input | Output |
 | ---- | ----- | ------ |
@@ -121,6 +120,8 @@ from all messages. Addresses from resulting list are expected to be unique.
 #### Method GetRange
 
 GetRange of data payload. Range is a pair (offset, length).
+Requested range can be restored by concatenation of all chunks
+keeping receiving order.
 
 | Name | Input | Output |
 | ---- | ----- | ------ |
@@ -160,6 +161,10 @@ DeleteResponse is empty because we cannot guarantee permanent object removal
 in distributed system.
 
 
+| Field | Type | Label | Description |
+| ----- | ---- | ----- | ----------- |
+| Meta | [service.ResponseMetaHeader](#service.ResponseMetaHeader) |  | ResponseMetaHeader contains meta information based on request processing by server (should be embedded into message) |
+
 
 <a name="object.GetRangeHashRequest"></a>
 
@@ -185,6 +190,7 @@ in distributed system.
 | Field | Type | Label | Description |
 | ----- | ---- | ----- | ----------- |
 | Hashes | [bytes](#bytes) | repeated | Hashes is a homomorphic hashes of all ranges |
+| Meta | [service.ResponseMetaHeader](#service.ResponseMetaHeader) |  | ResponseMetaHeader contains meta information based on request processing by server (should be embedded into message) |
 
 
 <a name="object.GetRangeRequest"></a>
@@ -210,6 +216,7 @@ in distributed system.
 | Field | Type | Label | Description |
 | ----- | ---- | ----- | ----------- |
 | Fragment | [bytes](#bytes) |  | Fragment of object's payload |
+| Meta | [service.ResponseMetaHeader](#service.ResponseMetaHeader) |  | ResponseMetaHeader contains meta information based on request processing by server (should be embedded into message) |
 
 
 <a name="object.GetRequest"></a>
@@ -236,6 +243,7 @@ in distributed system.
 | ----- | ---- | ----- | ----------- |
 | object | [Object](#object.Object) |  | Object header and some payload |
 | Chunk | [bytes](#bytes) |  | Chunk of remaining payload |
+| Meta | [service.ResponseMetaHeader](#service.ResponseMetaHeader) |  | ResponseMetaHeader contains meta information based on request processing by server (should be embedded into message) |
 
 
 <a name="object.HeadRequest"></a>
@@ -262,6 +270,7 @@ in distributed system.
 | Field | Type | Label | Description |
 | ----- | ---- | ----- | ----------- |
 | Object | [Object](#object.Object) |  | Object without payload |
+| Meta | [service.ResponseMetaHeader](#service.ResponseMetaHeader) |  | ResponseMetaHeader contains meta information based on request processing by server (should be embedded into message) |
 
 
 <a name="object.PutRequest"></a>
@@ -299,6 +308,7 @@ in distributed system.
 | Field | Type | Label | Description |
 | ----- | ---- | ----- | ----------- |
 | Address | [refs.Address](#refs.Address) |  | Address of object (container id + object id) |
+| Meta | [service.ResponseMetaHeader](#service.ResponseMetaHeader) |  | ResponseMetaHeader contains meta information based on request processing by server (should be embedded into message) |
 
 
 <a name="object.SearchRequest"></a>
@@ -325,6 +335,7 @@ in distributed system.
 | Field | Type | Label | Description |
 | ----- | ---- | ----- | ----------- |
 | Addresses | [refs.Address](#refs.Address) | repeated | Addresses of found objects |
+| Meta | [service.ResponseMetaHeader](#service.ResponseMetaHeader) |  | ResponseMetaHeader contains meta information based on request processing by server (should be embedded into message) |
 
  <!-- end messages -->
 
diff --git a/proto-docs/service.md b/proto-docs/service.md
index 08a1065..2b6b33e 100644
--- a/proto-docs/service.md
+++ b/proto-docs/service.md
@@ -7,6 +7,7 @@
 
   - Messages
     - [RequestMetaHeader](#service.RequestMetaHeader)
+    - [ResponseMetaHeader](#service.ResponseMetaHeader)
     
 
 - [service/verify.proto](#service/verify.proto)
@@ -43,6 +44,19 @@ RequestMetaHeader contains information about request meta headers
 | Epoch | [uint64](#uint64) |  | Epoch for user can be empty, because node sets epoch to the actual value |
 | Version | [uint32](#uint32) |  | Version defines protocol version TODO: not used for now, should be implemented in future |
 
+
+<a name="service.ResponseMetaHeader"></a>
+
+### Message ResponseMetaHeader
+ResponseMetaHeader contains meta information based on request processing by server
+(should be embedded into message)
+
+
+| Field | Type | Label | Description |
+| ----- | ---- | ----- | ----------- |
+| Epoch | [uint64](#uint64) |  | Current NeoFS epoch on server |
+| Version | [uint32](#uint32) |  | Version defines protocol version TODO: not used for now, should be implemented in future |
+
  <!-- end messages -->
 
  <!-- end enums -->
diff --git a/proto-docs/state.md b/proto-docs/state.md
index 7950455..2b3de4a 100644
--- a/proto-docs/state.md
+++ b/proto-docs/state.md
@@ -10,6 +10,8 @@
   - Messages
     - [DumpRequest](#state.DumpRequest)
     - [DumpResponse](#state.DumpResponse)
+    - [DumpVarsRequest](#state.DumpVarsRequest)
+    - [DumpVarsResponse](#state.DumpVarsResponse)
     - [HealthRequest](#state.HealthRequest)
     - [HealthResponse](#state.HealthResponse)
     - [MetricsRequest](#state.MetricsRequest)
@@ -39,6 +41,7 @@ rpc Netmap(NetmapRequest) returns (.bootstrap.SpreadMap);
 rpc Metrics(MetricsRequest) returns (MetricsResponse);
 rpc HealthCheck(HealthRequest) returns (HealthResponse);
 rpc DumpConfig(DumpRequest) returns (DumpResponse);
+rpc DumpVars(DumpVarsRequest) returns (DumpVarsResponse);
 
 ```
 
@@ -73,6 +76,15 @@ The request should be signed.
 | Name | Input | Output |
 | ---- | ----- | ------ |
 | DumpConfig | [DumpRequest](#state.DumpRequest) | [DumpResponse](#state.DumpResponse) |
+#### Method DumpVars
+
+DumpVars returns debug variables for the current node.
+To permit access, used server config options.
+The request should be signed.
+
+| Name | Input | Output |
+| ---- | ----- | ------ |
+| DumpVars | [DumpVarsRequest](#state.DumpVarsRequest) | [DumpVarsResponse](#state.DumpVarsResponse) |
  <!-- end services -->
 
 
@@ -100,6 +112,30 @@ Config stored in JSON encoded into slice of bytes.
 | Config | [bytes](#bytes) |  |  |
 
 
+<a name="state.DumpVarsRequest"></a>
+
+### Message DumpVarsRequest
+DumpVarsRequest message to fetch current server debug variables.
+
+
+| Field | Type | Label | Description |
+| ----- | ---- | ----- | ----------- |
+| Meta | [service.RequestMetaHeader](#service.RequestMetaHeader) |  | RequestMetaHeader contains information about request meta headers (should be embedded into message) |
+| Verify | [service.RequestVerificationHeader](#service.RequestVerificationHeader) |  | RequestVerificationHeader is a set of signatures of every NeoFS Node that processed request (should be embedded into message) |
+
+
+<a name="state.DumpVarsResponse"></a>
+
+### Message DumpVarsResponse
+DumpVarsResponse message contains current server debug variables.
+Variables stored in JSON encoded into slice of bytes.
+
+
+| Field | Type | Label | Description |
+| ----- | ---- | ----- | ----------- |
+| Variables | [bytes](#bytes) |  |  |
+
+
 <a name="state.HealthRequest"></a>
 
 ### Message HealthRequest