Merge pull request #936 from pipecat-ai/docs/pr-4814

docs: update for pipecat PR #4814

Author: markbackman

pipecat/fundamentals/metrics.mdx

@@ -174,7 +174,7 @@ class MetricsLogger(FrameProcessor):
                 if isinstance(d, TTFBMetricsData):
                     print(f"!!! MetricsFrame: {frame}, ttfb: {d.value}")
                 elif isinstance(d, TTFAMetricsData):
-                    print(f"!!! MetricsFrame: {frame}, ttfa: {d.value}")
+                    print(f"!!! MetricsFrame: {frame}, ttfa: {d.ttfa}, ttfb: {d.ttfb}, leading_silence: {d.leading_silence}")
                 elif isinstance(d, ProcessingMetricsData):
                     print(f"!!! MetricsFrame: {frame}, processing: {d.value}")
                 elif isinstance(d, LLMUsageMetricsData):
@@ -203,11 +203,13 @@ Time To First Byte — measures how long until the first byte of a response is r
 
 ### TTFAMetricsData
 
-Time To First Audio — measures the time from a TTS request to the first audible audio sample. This includes the time to first byte plus any leading silence padding added by the service. Comparing TTFA against TTFB reveals how much of the perceived latency is silence padding rather than service response time.
+Time To First Audio — measures the time from a TTS request to the first audible audio sample. This includes the time to first byte plus any leading silence padding added by the service. `TTFAMetricsData` reports the latency breakdown directly, showing how much of the perceived latency is silence padding.
 
-| Field   | Type    | Description                 |
-| ------- | ------- | --------------------------- |
-| `value` | `float` | TTFA measurement in seconds |
+| Field              | Type    | Description                                                                                                  |
+| ------------------ | ------- | ------------------------------------------------------------------------------------------------------------ |
+| `ttfa`             | `float` | TTFA measurement in seconds (`ttfb` plus `leading_silence`)                                                  |
+| `ttfb`             | `float` | Time-to-first-byte in seconds. Mirrors the standalone `TTFBMetricsData` for convenience, not a separate measurement |
+| `leading_silence`  | `float` | Silence padding before the first audible sample, in seconds (`ttfa` minus `ttfb`)                            |
 
 ### ProcessingMetricsData