> For the complete documentation index, see [llms.txt](/llms.txt)

# GS2-Log SDK for Game Engine API Reference

Specifications of models and API references for GS2-Log SDK for Game Engine



## Models

### EzInGameLog

In-game Log

A custom log entry sent from the game client or server-side scripts. Unlike access logs which are automatically generated by GS2 API calls, in-game logs are explicitly sent by game developers to record game-specific events such as player actions, game state changes, or business metrics.

|  | Type | Condition | Required | Default | Value Limits | Description |
| --- | --- | --- | --- | --- | --- | --- |
| timestamp | long |  | ✓ |  |  | Timestamp<br>The date and time when the in-game log was sent. |
| userId | string |  |  |  |  ~ 128 chars | User ID |
| tags | [List&lt;EzInGameLogTag&gt;](#ezingamelogtag) |  |  | [] | 0 ~ 20 items | Tags<br>Key-value pairs attached to the log entry for filtering and categorization. Tags enable efficient searching and aggregation of in-game logs (e.g., event type, stage ID, item category). |
| payload | string |  | ✓ |  |  ~ 10485760 chars | Payload<br>The custom log data in JSON format. Can contain any game-specific information such as player actions, game state, or business metrics. Maximum 10MB. |

**Related methods:**
sendInGameLog - Send in-game logs


---

### EzInGameLogTag

In-game Log Tag

A key-value pair used to annotate in-game log entries for filtering and categorization. Each tag key must be unique within a single log entry.

|  | Type | Condition | Required | Default | Value Limits | Description |
| --- | --- | --- | --- | --- | --- | --- |
| key | string |  | ✓ |  |  ~ 64 chars | Tag Key<br>The key name for this tag. Used as the filter criterion when searching in-game logs. |
| value | string |  | ✓ |  |  ~ 128 chars | Tag Value<br>The value for this tag. Combined with the key, enables filtering logs by specific criteria (e.g., key="stageId", value="stage-001"). |

**Related methods:**
sendInGameLog - Send in-game logs


**Related models:**
EzInGameLog - In-game Log



---

## Methods

### sendInGameLog

Send in-game logs

#### Request

|  | Type | Condition | Required | Default | Value Limits | Description |
| --- | --- | --- | --- | --- | --- | --- |
| namespaceName | string |  | ✓|  |  ~ 128 chars | Namespace name<br>Unique Namespace name. Specified using alphanumeric characters, hyphens (-), underscores (_), and periods (.). |
| tags | [List&lt;EzInGameLogTag&gt;](#ezingamelogtag) |  | | [] | 0 ~ 20 items | Tags<br>Key-value pairs attached to the log entry for filtering and categorization. Tags enable efficient searching and aggregation of in-game logs (e.g., event type, stage ID, item category). |
| payload | string |  | ✓|  |  ~ 10485760 chars | Payload<br>The custom log data in JSON format. Can contain any game-specific information such as player actions, game state, or business metrics. Maximum 10MB. |
| gameSession | GameSession | | |  |  | GameSession |

#### Result

|  | Type | Description |
| --- | --- | --- |
| item | [EzInGameLog](#ezingamelog) | In-game log|

#### Implementation Example




**Unity (UniTask)**
```csharp
    var domain = gs2.Log.Namespace(
        namespaceName: "namespace-0001"
    ).Me(
        gameSession: GameSession
    );
    var result = await domain.SendInGameLogAsync(
        payload: "{\"category\": \"use-item\", \"count\": 1, \"itemId\": \"item-0001\"}",
        tags: new List<Gs2.Unity.Gs2Log.Model.EzInGameLogTag> {
            new Gs2.Unity.Gs2Log.Model.EzInGameLogTag() {
                Key = "tag1",
                Value = "value1",
            },
            new Gs2.Unity.Gs2Log.Model.EzInGameLogTag() {
                Key = "tag2",
                Value = "value2",
            },
        }
    );
    var item = await result.ModelAsync();

```

**Unity (Vanilla)**
```cs
    var domain = gs2.Log.Namespace(
        namespaceName: "namespace-0001"
    ).Me(
        gameSession: GameSession
    );
    var future = domain.SendInGameLogFuture(
        payload: "{\"category\": \"use-item\", \"count\": 1, \"itemId\": \"item-0001\"}",
        tags: new List<Gs2.Unity.Gs2Log.Model.EzInGameLogTag> {
            new Gs2.Unity.Gs2Log.Model.EzInGameLogTag() {
                Key = "tag1",
                Value = "value1",
            },
            new Gs2.Unity.Gs2Log.Model.EzInGameLogTag() {
                Key = "tag2",
                Value = "value2",
            },
        }
    );
    yield return future;
    if (future.Error != null)
    {
        onError.Invoke(future.Error, null);
        yield break;
    }
    var future2 = future.Result.ModelFuture();
    yield return future2;
    if (future2.Error != null)
    {
        onError.Invoke(future2.Error, null);
        yield break;
    }
    var result = future2.Result;

```

**Unreal Engine 5**
```cpp
    const auto Domain = Gs2->Log->Namespace(
        "namespace-0001" // namespaceName
    )->Me(
        GameSession
    );
    const auto Future = Domain->SendInGameLog(
        "{\"category\": \"use-item\", \"count\": 1, \"itemId\": \"item-0001\"}", // payload
        []
        {
            auto v = MakeShared<TArray<TSharedPtr<Gs2::UE5::Log::Model::FEzInGameLogTag>>>();
            v->Add(
                MakeShared<Gs2::UE5::Log::Model::FEzInGameLogTag>()
                ->WithKey(TOptional<FString>("tag1"))
                ->WithValue(TOptional<FString>("value1"))
            );
            v->Add(
                MakeShared<Gs2::UE5::Log::Model::FEzInGameLogTag>()
                ->WithKey(TOptional<FString>("tag2"))
                ->WithValue(TOptional<FString>("value2"))
            );
            return v;
        }() // tags
    );
    Future->StartSynchronousTask();
    if (Future->GetTask().IsError())
    {
        return false;
    }

    // obtain changed values / result values
    const auto Future2 = Future->GetTask().Result()->Model();
    Future2->StartSynchronousTask();
    if (Future2->GetTask().IsError())
    {
        return Future2->GetTask().Error();
    }
    const auto Result = Future2->GetTask().Result();

```


---