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Merge pull request #44 from matrix-org/michaelk/docs_about_rageshake_files 

Docs about rageshake files
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@ -68,10 +68,16 @@ logs.)
* `id`: textual identifier for the logs. Used as the filename, as above.
* `lines`: log data. Newlines should be encoded as `\n`, as normal in JSON).
A summary of the current log file formats that are uploaded for `log` and
`compressed-log` is [available](docs/submitted_reports.md).
* `compressed-log`: a gzipped logfile. Decompressed and then treated the same as
`log`.
Compressed logs are not supported for the JSON upload encoding.
A summary of the current log file formats that are uploaded for `log` and
`compressed-log` is [available](docs/submitted_reports.md).
* `file`: an arbitrary file to attach to the report. Saved as-is to disk, and
a link is added to the github issue. The filename must be in the format

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Add documentation on the types and formats of files submitted to the rageshake server

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# Common report styles
Rageshakes can come from a number of applications, and we provide some practical notes on the generated format.
At present these should not be considered absolute nor a structure to follow; but an attempt to document the currently visible formats as of January 2022.
## Feedback
Log files are not transmitted; the main feedback is entirely within the user message body.
This occurs from all platforms.
## Element Web / Element Desktop
Log files are transmitted in reverse order (0000 is the youngest)
Log line format:
```
2022-01-17T14:57:20.806Z I Using WebAssembly Olm
< ---- TIMESTAMP ------> L <-- Message ----
L = log level, (W=Warn, I=Info, etc)
```
New log files are started each restart of the app, but some log files may not contain all data from the start of the session.
## Element iOS
Crash Log is special and is sent only once (and deleted on the device afterwards)
`crash.log`
Following logs are available, going back in time with ascending number.
console.log with no number is the current log file.
```
console.log (newest)
console-1.log
...
console-49.log (oldest)
console-nse.log (newest)
console-nse-1.log
...
console-nse-49.log (oldest)
console-share.log (newest)
console-share-1.log
console-share-49.log (oldest)
```
## Element Android
There is a historical issue with the naming of files, documented in [issue #40](https://github.com/matrix-org/rageshake/issues/40).
Log file 0000 is odd, it contains the logcat data if sent.
Log line format:
```
01-17 14:59:30.657 14303 14303 W Activity: Slow Operation:
<-- TIMESTAMP ---> <-P-> <-T-> L <-- Message --
L = Log Level (W=Warn, I=Info etc)
P = Process ID
T = Thread ID
```
Remaining log files are transmitted according to their position in the round-robin logging to file - there will be (up to) 7 files written to in a continious loop; one of the seven will be the oldest, the rest will be in order.
Log line format:
```
2022-01-17T13:06:36*838GMT+00:00Z 12226 D/ /Tag: Migration: Importing legacy session
< ---- TIMESTAMP ---------------> <-P-> L <-- Message ----
L = log level, (W=Warn, I=Info, etc)
P = Process ID
```
Once the fix to #40 is in place, we will see the following files:
```
logcatError.log
logcat.log
crash.log
keyrequests.log
log-[1-7].log
```
Log 1-7 are logs from a round-robin buffer and are ordered but the start point is undefined