Metrics Export

hitspec can export test execution metrics to external monitoring systems. This is especially useful for stress testing, where you want to track latency, error rates, and throughput over time.

Supported Formats

Format	Flag	Description
Prometheus	`--metrics prometheus`	Exposes metrics on an HTTP endpoint
DataDog	`--metrics datadog`	Sends metrics to DataDog API
JSON	`--metrics json`	Writes metrics to a file or stdout

Prometheus

Exposes metrics on an HTTP endpoint (default port 9090) for Prometheus to scrape.

hitspec run api.http --stress -d 5m -r 100 \
  --metrics prometheus \
  --metrics-port 9090

Metrics are available at http://localhost:9090/metrics while the test runs.

Flag	Env Var	Default	Description
`--metrics-port`	`HITSPEC_METRICS_PORT`	`9090`	Port for the metrics endpoint

DataDog

Sends metrics directly to the DataDog API.

hitspec run api.http --stress -d 5m -r 100 \
  --metrics datadog \
  --datadog-api-key "$DD_API_KEY"

Flag	Env Var	Default	Description
`--datadog-api-key`	`DD_API_KEY`		DataDog API key (required)
`--datadog-site`	`DD_SITE`	`datadoghq.com`	DataDog site
`--datadog-tags`	`DD_TAGS`		Comma-separated tags

hitspec run api.http --stress -d 5m -r 100 \
  --metrics datadog \
  --datadog-api-key "$DD_API_KEY" \
  --datadog-site "datadoghq.eu" \
  --datadog-tags "env:staging,service:api"

JSON

Writes aggregate metrics to a file or stdout.

# Write to file
hitspec run api.http --stress -d 1m -r 50 \
  --metrics json \
  --metrics-file metrics.json

# Write to stdout
hitspec run api.http --stress -d 1m -r 50 \
  --metrics json

Flag	Env Var	Description
`--metrics-file`	`HITSPEC_METRICS_FILE`	Output file (defaults to stdout)

Multiple Exporters

Export to multiple formats simultaneously:

hitspec run api.http --stress -d 5m -r 100 \
  --metrics prometheus,json \
  --metrics-port 9090 \
  --metrics-file metrics.json

Exported Metrics

The metrics include:

Metric	Description
Total requests	Number of requests sent
Success count	Number of successful responses
Failure count	Number of failed responses
Total duration	Overall test duration
Min/Max/Avg latency	Latency statistics
P50/P95/P99 latency	Percentile latencies
Status codes	Breakdown by HTTP status code
Per-test breakdown	Metrics for each named request

Last modified on February 10, 2026

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Output Formats

Integrations

Supported Formats

Prometheus

DataDog

JSON

Multiple Exporters

Exported Metrics

​Supported Formats

​Prometheus

​DataDog

​JSON

​Multiple Exporters

​Exported Metrics

Supported Formats

Prometheus

DataDog

JSON

Multiple Exporters

Exported Metrics