---
title: "Reference: Tracing | Observability"
description: Core Tracing classes and methods
asIndexPage: true
packages:
  - "@mastra/core"
---

import PropertiesTable from "@site/src/components/PropertiesTable";

# Observability Instances

## DefaultObservabilityInstance

Default implementation of the ObservabilityInstance interface.

### Constructor

```typescript
new DefaultObservabilityInstance(config: ObservabilityInstanceConfig)
```

Creates a new DefaultObservabilityInstance with the specified configuration.

### Properties

Inherits all properties and methods from BaseObservabilityInstance.

## BaseObservabilityInstance

Base class for custom ObservabilityInstance implementations.

### Methods

#### getConfig

```typescript
getConfig(): Readonly<Required<ObservabilityInstanceConfig>>
```

Returns the current observability configuration.

#### getExporters

```typescript
getExporters(): readonly ObservabilityExporter[]
```

Returns all configured exporters.

#### getSpanOutputProcessors

```typescript
getSpanOutputProcessors(): readonly SpanOutputProcessor[]
```

Returns all configured span output processors.

#### getLogger

```typescript
getLogger(): IMastraLogger
```

Returns the logger instance for exporters and other components.

#### startSpan

```typescript
startSpan<TType extends SpanType>(
  options: StartSpanOptions<TType>
): Span<TType>
```

Start a new span of a specific SpanType. Creates the root span of a trace if no parent is provided.

<PropertiesTable
  props={[
    {
      name: "type",
      type: "SpanType",
      description: "Type of span to create",
      required: true,
    },
    {
      name: "name",
      type: "string",
      description: "Name of the span",
      required: true,
    },
    {
      name: "parent",
      type: "AnySpan",
      description: "Parent span (if not root)",
      required: false,
    },
    {
      name: "attributes",
      type: "SpanTypeMap[TType]",
      description: "Type-specific attributes",
      required: false,
    },
    {
      name: "metadata",
      type: "Record<string, any>",
      description: "User-defined metadata",
      required: false,
    },
    {
      name: "input",
      type: "any",
      description: "Initial input data",
      required: false,
    },
    {
      name: "customSamplerOptions",
      type: "CustomSamplerOptions",
      description: "Options for custom sampler",
      required: false,
    },
  ]}
/>

#### shutdown

```typescript
async shutdown(): Promise<void>
```

Shuts down all exporters and processors, cleaning up resources.

## Custom Implementation

To create a custom ObservabilityInstance implementation, extend BaseObservabilityInstance:

```typescript
class CustomObservabilityInstance extends BaseObservabilityInstance {
  constructor(config: ObservabilityInstanceConfig) {
    super(config);
    // Custom initialization
  }

  // Override methods as needed
  startSpan<TType extends SpanType>(
    options: StartSpanOptions<TType>,
  ): Span<TType> {
    // Custom span creation logic
    return super.startSpan(options);
  }
}
```

## See Also

### Documentation

- [Tracing Overview](/docs/v1/observability/tracing/overview) - Concepts and usage guide
- [Configuration Reference](/reference/v1/observability/tracing/configuration) - Configuration options
- [Interfaces Reference](/reference/v1/observability/tracing/interfaces) - Type definitions
- [Spans Reference](/reference/v1/observability/tracing/spans) - Span lifecycle and methods

### Exporters

- [DefaultExporter](/reference/v1/observability/tracing/exporters/default-exporter) - Storage persistence
- [CloudExporter](/reference/v1/observability/tracing/exporters/cloud-exporter) - Mastra Cloud integration
- [ConsoleExporter](/reference/v1/observability/tracing/exporters/console-exporter) - Debug output
