Monitoring SpeechKit Hybrid services
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Updated at July 13, 2026
SpeechKit Hybrid collects and stores metrics in Prometheus format. For more information about metric types, see this Prometheus guide.
SpeechKit Hybrid service metrics are available at the URL:
<IP_address>:17002/metrics/prometheus
Where:
<IP address>: SpeechKit Hybrid IP address in your network.
Common SpeechKit Hybrid metrics
| Metric | Type | Description |
|---|---|---|
grpc_code_* |
COUNTER | Number of responses with a certain gRPC status code. Each code refers to a certain metric, e.g., grpc_code_ok, grpc_code_canceled, etc. For a list of codes, see this gRPC article. |
Speech synthesis metrics
| Metric | Type | Description |
|---|---|---|
synthesis_sps |
GAUGE | Number of seconds of synthesized text generated in a second at SpeechKit Hybrid runtime |
synthesis_latency |
HISTOGRAM | Service response time histogram in milliseconds |
Speech recognition metrics
| Metric | Type | Description |
|---|---|---|
in_flight_requests |
GAUGE | Number of active sessions |
recognize_sps |
GAUGE | Number of seconds of recognized speech processed in a second at SpeechKit Hybridruntime |
recognize_rtf |
HISTOGRAM | Distribution histogram of a Real Time Factor value that is equal to the ratio of recognition time to the duration of recognized speech expressed as a percentage. |
Performance monitoring
To monitor SpeechKit Hybrid performance, set the target metric values:
synthesis_sps: Required number of synthesized speech seconds per real-time second.recognize_sps: Required number of recognized speech milliseconds per second.synthesis_latency: Allowed response latency for the speech synthesis application.recognize_rtf: Allowed ratio of speech recognition time to input speech duration. The recommended value is100; a larger value indicates that the server is unable handle the incoming requests.
Set up metric monitoring to track their deviation for the worse from the set target values:
- Decrease for SPS metrics.
- Excess for other metrics.