Single-row summary: invocations, failures, success rate, latency (vs prior window)

curl --request GET \
  --url https://api-sandbox.featherhq.com/v1/analytics/integrations/summary \
  --header 'x-api-key: <api-key>'

[
  {
    "current_invocations": 123,
    "previous_invocations": 123,
    "pct_change_invocations": 123,
    "current_failures": 123,
    "previous_failures": 123,
    "pct_change_failures": 123,
    "current_success_rate_pct": 123,
    "previous_success_rate_pct": 123,
    "pct_change_success_rate_pct": 123,
    "current_avg_latency_ms": 123,
    "previous_avg_latency_ms": 123,
    "pct_change_avg_latency_ms": 123,
    "current_p95_latency_ms": 123,
    "previous_p95_latency_ms": 123,
    "pct_change_p95_latency_ms": 123
  }
]