# tt_all_devices_accessible

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## Name

### Prometheus Metric Name

```
tt_all_devices_accessible
```

### Metric Path (tt-telemetry)

Schema:

```
{hostname}/telemetry/tt_all_devices_accessible
```

Example path:

```
bh-glx-c09u02/telemetry/tt_all_devices_accessible
```

## Description

Whether all devices on this host are accessible and fully responsive. This provides a system-wide accessibility indicator.

This is the aggregate of the per-device `tt_device_accessible` metric: it is true only when *every* device on the host is accessible, meaning that for each device all of its metrics were readable and its PCIe link and all of its NOCs are alive. See [tt_device_accessible](tt_device_accessible.md) for the per-device criteria.

If the driver fails to initialize (no devices to collect from), this metric is reported false.

## Values

**Type:** Boolean

**Units:** None

**Allowable values:**
- **True (1)**: All devices are accessible.
- **False (0)**: One or more devices are not accessible (a metric could not be read, or a PCIe link or NOC appears hung), or the driver failed to initialize.

## Prometheus Labels

|Label Name|Value|
|---|---|
|hostname|The host from which the metric was collected.|
|hall|The datacenter hall where the host is located. Sourced from the Factory System Descriptor (FSD).|
|aisle|The datacenter aisle where the host is located. Sourced from the Factory System Descriptor (FSD).|
|rack|The rack number where the host is located. Sourced from the Factory System Descriptor (FSD).|
|shelf_u|The shelf U position in the rack where the host is located. Sourced from the Factory System Descriptor (FSD).|