About the Domain Inspector stats

Fastly's Domain Inspector builds on our existing Observability interface by providing real-time and historic visibility into detailed response data for traffic from your domains and subdomains to Fastly.

Before you begin

Domain Inspector is disabled by default. Anyone assigned the role of superuser can enable a 30-day trial directly in the web interface. After the trial expires, Domain Inspector can be purchased for an account by contacting sales@fastly.com. Once purchased, it can be enabled in the web interface by anyone assigned the role of superuser or engineer, which will result in changes to your monthly bill. When Domain Inspector is enabled, any user will be able to view the real-time and historic stats specific to Domain Inspector.

Be sure you know how to access the web interface controls and pay specific attention to basic information about the Observability interface before learning about the Domain Inspector specifics you'll encounter here.

About the Domain Inspector Observability page

Once Domain Inspector is enabled for your account, the Observability page gains additional navigation controls that appear below the service name and ID details.

Enabling and disabling Domain Inspector

Domain Inspector can be enabled and disabled directly in the web interface by anyone assigned the role of superuser.

Enabling Domain Inspector

You can enable Domain Inspector from the Real-time stats page or from the Edge Observer page.

To enable Domain Inspector for a service via the Real-time stats page:

1. Log in to the Fastly web interface and click Observability.
2. Click Real-time.
3. Click Domains .
4. Click the Domain Inspector switch to the ON position to enable Domain Inspector for the service.

To enable Domain Inspector for a service via the Edge Observer page:

1. Log in to the Fastly web interface and click Observability.
2. Click System Dashboards.
3. From the system dashboards menu, select Domain Inspector.
4. Click the Monitor domain responses switch to the ON position to enable Domain Inspector for the service.

Once Domain Inspector is enabled, you can start viewing real-time metrics about your domains immediately. Historic metrics usually become available two minutes after the end of each minute, but can take up to 15 minutes to appear.

Disabling Domain Inspector

You can disable Domain Inspector from the Real-time stats page or from the Edge Observer page.

To disable Domain Inspector for a service via the Real-time stats page:

1. Log in to the Fastly web interface and click Observability.
2. Click Real-time.
3. Click Domains.
4. Click Settings.
5. Click the Domain Inspector switch to the off position to disable Domain Inspector for the service.

To disable Domain Inspector for a service via the Edge Observer page:

1. Log in to the Fastly web interface and click Observability.
2. Click System Dashboards.
3. From the system dashboards menu, select Domain Inspector.
4. Click the Monitor domain responses switch to the OFF position to disable Domain Inspector for the service.

About the Overview tab

For both real-time and historical stats, an Overview tab appears that provides stats details about your entire service as described in our guide about the Observability page.

About the Domains tab summary dashboards

For each domain and subdomain associated with your service, the Domains tab for both real-time and historic stats displays a small summary dashboard providing immediate visibility into delivery metrics.

By default, the summary dashboard specifically describes:

• the number of edge requests and their edge hit ratio received by Fastly from your domains and subdomains.
• the bandwidth received from your domains and subdomains. The bandwidth calculation formula is response header bytes + response body bytes.
• a count of each of the 1XX, 2XX, 3XX, 4XX, and 5XX HTTP status codes returned from your domain, grouped by type.

If you've selected Detailed graphs from the menu to the right of the Smooth scrolling checkbox, origin metrics appear in addition to the edge metrics displayed by default.

About the Domains tab graphs

Below the summary dashboard data, for both real-time and historic stats, graphs appear for each domain or subdomain associated with your service. These graphs provide a visual representation of dashboard information over time. Specifically:

• a Response Status Codes graph detailing the number of responses from your domain or subdomain.
• an Edge Requests graph detailing the number of requests sent by end users to Fastly from your domain or subdomain.

If you've selected Detailed graphs from the menu to the right of the Smooth scrolling checkbox, the Response Status Codes graph disappears and the information appears as two separate graphs, one for Edge Response Status Codes and one for Origin Response Status Codes. Also, the Edge Requests graph is replaced by the Edge Hit Ratio graph detailed below.

Viewing more origin details graphs

Below the Domains tab graphs, you'll notice a link to More origin details. Clicking this link displays the following additional graphs about each domain after the Response Status Codes and Edge Requests graphs:

• Edge Hit Ratio metrics shows the ratio of cache hits to cache misses at the edge for your domain.
• Status 5XX Details metrics shows the breakdown between the number of HTTP Status 500 (Internal Server Error), 501 (Not Implemented), 502 (Bad Gateway), 503 (Service Unavailable), 504 (Gateway Timeout), and 505 (HTTP Version Not Supported) requests.
• Status 4XX Details metrics shows the breakdown between the number of HTTP Status 400 (Bad Request), 401 (Unauthorized), 403 (Forbidden), 404 (Not Found), 416 (Range Not Satisfiable), and 429 (Too Many Requests) requests.
• Status 3XX Details metrics shows the breakdown between the number of HTTP Status 301 (Moved Permanently), 302 (Found), and 304 (Not Modified) requests.
• Status 2XX Details metrics shows the breakdown between the number of HTTP Status 200 (Success), 204 (No Content), and 206 (Partial Content) requests.
• Bandwidth metrics shows the amount of bandwidth from your domain.
• Origin Offload metrics shows the ratio of response bytes delivered from the edge compared to what is delivered from origin for your domain.
• Origin Requests metrics shows the number of requests sent to origin for your domain.

If you've selected Detailed graphs from the menu to the right of the Smooth scrolling checkbox, the Response Status Codes graph disappears and the information appears as two separate graphs, one for Edge Response Status Codes and one for Origin Response Status Codes. In addition, the graphs for each type of HTTP status code returned are broken out into separate graphs, one graph for responses with the status code received for your domain at the edge and another for responses with the status code received from your origin.

How often graph data is updated

For real-time stats, the Domains tab graphs display data for the last 75 seconds and update continuously as more data is received by each domain and subdomain listed.

For historic stats, you can specify the timeframe over which data is displayed for the Domains tabs graphs. By default, they retain the same filters you set on the Overview tab.

What's next

Be sure to familiarize yourself with the fundamentals of working with Observability graphs before continuing. Dig deeper into details about all areas of the web interface controls before you move on to using them to work with services.