Listeners & Endpoints
The Listeners view shows all message endpoints across your monitored services — both inbound listeners (where messages are received) and outbound senders (where messages are published).
Endpoint Grid
Each endpoint appears as a row with:
| Column | Description |
|---|---|
| URI | The endpoint address (e.g., rabbitmq://my-queue, sqlserver://inbox) |
| Service | Which monitored service owns this endpoint |
| Type | Listener / Sender / Durable |
| Status | Accepting / Stopped / TooBusy / Latched |
| Transport | RabbitMQ / InMemory / SqlServer / Kafka / etc. |
| Circuit Breaker | None / Active / Paused |
| Back Pressure | None / Triggered |
Status Values
| Status | Meaning |
|---|---|
| Accepting | Endpoint is running and processing messages normally |
| Stopped | Endpoint has been paused by an operator |
| TooBusy | Back pressure is throttling this endpoint |
| Latched | Circuit breaker has tripped — endpoint is paused due to repeated failures |
Endpoint Detail
Click an endpoint to open the detail panel:
Configuration
- Address — full endpoint URI
- Mode — how messages are received (Sequential, Parallel, Durable)
- Buffering limits —
MaximumMessagesToReceive,MaximumMessageWaitInQueue,BatchSize - Circuit breaker settings — failure rate threshold, sampling period, pause duration, reset success threshold
Circuit Breaker
When a circuit breaker is configured, the detail panel shows:
- Status — Closed (normal) / Open (tripped) / Half-Open (testing)
- Current failure rate — percentage of recent messages that failed
- Failures in window — count of failures within the sampling period
- Tripped at — timestamp when the breaker opened
- Estimated reset — when the breaker will attempt to close
A tripped circuit breaker pauses the listener to give the downstream system time to recover. Wolverine will periodically test recovery by allowing a small number of messages through (Half-Open state).
Back Pressure
When back pressure is active:
- Status — Active / None
- Queue depth — current number of buffered messages
- Limit — the configured
MaximumMessagesToReceivethreshold - Triggered at — when back pressure was activated
Endpoint Controls
Pause / Restart
Pause Listener — immediately stop processing messages on this endpoint. Messages remain in the queue and will be processed when the listener is restarted.
Restart Listener — resume processing on a paused endpoint.
Pause All / Restart All — apply the operation to all endpoints in the service. Useful for planned maintenance.
Edit Buffering Limits
Opens a form to adjust:
- Max messages to receive — how many messages to buffer in memory
- Max wait time — how long messages can wait in the buffer before being rejected
- Batch size — how many messages to pull per receive operation
Changes take effect immediately without restarting the service.
Edit Circuit Breaker
Opens a form to adjust:
- Failure rate threshold — what percentage of failures (0–100%) triggers the breaker
- Sampling period — the time window over which failures are counted
- Pause duration — how long to pause the endpoint when the breaker trips
- Success threshold — how many consecutive successes are needed to close the breaker
Changes are applied to the running endpoint without restart.
Transport Type Icons
CritterWatch displays a transport icon alongside each endpoint URI to make it easy to identify at a glance:
- RabbitMQ (rabbit icon)
- SQL Server (database icon)
- In-memory (lightning bolt icon)
- Kafka (stream icon)
- Azure Service Bus (cloud icon)