| Availability | Within a time range, the ratio of the number of times the target service can be accessed normally to the total number of accesses. |
| Wait Time | It is equal to the Pre-buffering Time + the first buffering time + all re-buffering times; |
| Pre-buffering Time | The time from the start of monitoring to the appearance of the first buffer includes the time of DNS resolution, the time of sending data Request and the time of receiving the first N data packets. |
| Fluency | Refers to the continuity and stability of video playback, a playback experience without interruptions, freezes or delays (no re-buffering time). |
| Buffering Time | The amount of time the streaming player remains in buffering state for the first time. |
| Re-buffering Time | The total time spent by the streaming media player buffering during playback. |
| Re-buffering Count | The number of times the streaming media player buffered during playback |
| First play duration | The time when the streaming media player starts playing. If buffering occurs again during a monitoring, this time refers to the time it takes from starting playing until buffering occurs again. |
| Playback time | The total time played by the streaming media player. If there is no buffering again in one monitoring, this time is equal to the First Play Time. |
| Page First Play Time | The time it takes from the beginning of monitoring to capturing the playback URL of the streaming media file, including DNS Time, Connection Establishment Time, etc. of the accessed page. |
| DNS Time | The time it takes to resolve a specified domain name into an IP address through the domain name resolution service |
| SSL Handshake Time | The time taken to establish a Secure Sockets Layer (SSL) connection between the browser and the WEB server. |
| Time to First Byte (TTFB) | The elapsed time from the end of sending HTTPRequest to the receipt of the first data packet returned by the server. |
| TCP connection time | The time it takes to establish a TCP/IP connection between the streaming media player and the server. |
| Content Download Time | When monitoring a streaming media page, the time it takes for the browser to receive non-first data packets returned by the WEB server. |
| Average Latency | The average time taken by all response packets |
| Packet Loss Rate | The number of sent packets that did not receive a response as a percentage of the number of packets sent |
| Bitrate | The speed of streaming media playback, in kbps. |
| Bitstream | The data stream transmitted through Network contains encoding information of audio, video or other media content. |
