# tt_arc_heartbeat

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## Name

### Prometheus Metric Name

```
tt_arc_heartbeat
```

### Metric Path (tt-telemetry)

Schema:

```
{hostname}/tray{tray}/chip{chip}/tt_arc_heartbeat
```

Example path:

```
bh-glx-c09u02/tray1/chip2/tt_arc_heartbeat
```

## Description

Indicates whether the ARC processor heartbeat counter has changed since the last telemetry update. A value of `true` (`1` in Prometheus) means the ARC firmware is running and responsive. A value of `false` (`0`) means the heartbeat counter did not change, which may indicate the ARC processor is hung or unresponsive. This metric is always available on all devices.

## Values

**Type:** Boolean

**Units:** None

**Allowable values:**
`true` (1) — heartbeat changed since the last update (ARC is alive).
`false` (0) — heartbeat did not change since the last update (ARC may be unresponsive).

## 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).|
|tray|The tray (UBB) that the device is located on.|
|chip|The ASIC location within the tray.|