# Monitoring manifest update time in AWS Elemental MediaPackage
Manifest header

MediaPackage added manifest header for low-latency HLS manifests.

MediaPackage playback responses include the following custom headers that indicate when MediaPackage last modified the manifest in non-dynamic ad insertion workflows. These headers are helpful when troubleshooting issues related to stale manifests.

**X-Amzn-Mediapackage-Manifest-Last-Part**  
This is only provided on requests for low-latency HLS manifests, and is the highest part sequence number in the manifest.

**X-MediaPackage-Manifest-Last-Sequence**  
This is the highest segment sequence number in the manifest.  
For HLS and CMAF, this is the highest segment number in the media playlist.  
See the following section for [manifest example](#manifest-last-updated).

**X-MediaPackage-Manifest-Last-Updated**  
The epoch timestamp in milliseconds when MediaPackage generates the segment referred to in `X-MediaPackage-Manifest-Last-Sequence`.

## HLS manifest example




### HLS manifest


MediaPackage determines the `X-MediaPackage-Manifest-Last-Sequence` value from the last segment in the manifest. For example, in the following manifest `index_1_3.ts` is the highest segment sequence number, so the value of `X-MediaPackage-Manifest-Last-Sequence` is `3`. The value of `X-MediaPackage-Manifest-Last-Updated` corresponds to the epoch timestamp in milliseconds when MediaPackage generates the last segment in the manifest.

```
#EXTM3U
#EXT-X-VERSION:3
#EXT-X-TARGETDURATION:8
#EXT-X-MEDIA-SEQUENCE:0
#EXTINF:7.500,
index_1_0.ts?m=1583172400
#EXTINF:7.500,
index_1_1.ts?m=1583172400
#EXTINF:7.500,
index_1_2.ts?m=1583172400
#EXTINF:7.500,
index_1_3.ts?m=1583172400
#EXT-X-ENDLIST
```