> ## Documentation Index
> Fetch the complete documentation index at: https://docs.honeycomb.io/llms.txt
> Use this file to discover all available pages before exploring further.
# Stream Logs from Fastly
> Stream logs from your Fastly CDN to Honeycomb using Fastly's log streaming feature for deeper visibility into your content distribution system behavior.
[Fastly](https://fastly.com) supports [streaming logs](https://docs.fastly.com/guides/streaming-logs/).
Send this data to Honeycomb for more insight into the behavior of your content distribution system.
## Configuration
To send Fastly logs to Honeycomb, refer to the [Fastly
documentation](https://docs.fastly.com/guides/streaming-logs/log-streaming-honeycomb).
## Sampling with VCL
Use [Sampling](/manage-data-volume/sample/guidelines/) to reduce data volume in your Honeycomb datasets where you are gathering Fastly data.
To implement sampling, we recommend a configuration that uses:
1. A **Logging** rule, which only forwards logs for requests if they are included in the sampled data.
2. **Varnish Configuration Language (VCL) snippet(s)**, which determines if the request should be sampled and at what rate.
### Configure Sampling
1. Update your Fastly configuration to create a logging rule, which forwards requests to Honeycomb only if the `req.http.log_request` local variable is set to `"1"`.
2. Create two **VCL snippets**:
1. **A table of sample rates for status codes**
For example, this table describes the number of events which flow through per sampled event based on status code.
`1` does not sample at all, `20` samples every 20th event, and so on.
To use, copy and adjust the rates in this table based on your projection traffic:
```varnish theme={}
table codes {
"200s": "20",
"300s": "5",
"400s": "3",
"500s": "1",
}
```
2. **Code that sets the sample rate based on HTTP status**
Use the following code to set the `req.http.log_request` variable (as mentioned in the logging rule) if sampling should be applied:
```varnish theme={}
set req.http.samplerate = table.lookup(codes, regsub(resp.status, "^([1-5])..", "\100s"), "1");
if (randombool(1, std.atoi(req.http.samplerate))) {
set req.http.log_request = "1";
} else {
set req.http.log_request = "0";
}
```
3. To ensure that the sample rate is included as a property of the JSON event and sent to Honeycomb, add this line at the same level of the `time` and `data` keys:
```varnish theme={}
"samplerate": %{req.http.samplerate}V,
```
This line encodes `samplerate` as a top0-level key sent to the Honeycomb API and causes all visualizations rendered by Honeycomb to appear as if **all** of the events, even ones which were sampled out, were sent.
You can extend this basic configuration to sample based on cache status or other fields if desired.