6. Follow-along: Metrics and observability

Sending fake traffic

We've just our , so it hasn't received much traffic at all yet. Let's go ahead and get some numbers in here so we can walk through what it might look like if we did have more traffic.

The Code Sandbox below contains a script that takes a URL and sends requests to it over a period of time. We'll use it to send fake traffic to our supergraph.

Go ahead and enter your URL (you can find that at the top of your 's README page). Then press the button to trigger the script!

Note: Right now, our Poetic Plates API does not have any protection against malicious queries or denial-of-service (DoS) attacks. In a future course, we'll cover more techniques to secure your . In the meantime, you can check out the Apollo technote about the topic to learn more about rate limiting, setting timeouts, pagination and more.

GraphOS Metrics

Let's head back to Studio, where our metrics live. Here, we'll see the kinds of insights Studio assembles for our supergraph based on usage, latency, and errors. We'll start with the Operations page.

Operation metrics

The page focuses on just that—operations that have been sent to our ! We've just faked a bunch of operations through the Code Sandbox, so we should be seeing some data here.


Operations page in Studio

We'll find an overview of request rates, service time, and error percentages, including specific operations for each of these that might be worth drilling deeper into.

This page also comes with some helpful filters which let us customize the specific time period, clients, and we want to see data for. By default, we'll see metrics for operations executed in the last day.


Operations page filter for a specific operation in Studio


Operations page details for a specific operation in Studio

Note: We recommend that clients clearly name each they send to the , so we can easily view them in our metrics.

By clicking into an individual , we can see more specific metrics along with the operation signature, which shows us the particular that were involved in the . With that knowledge, we can jump over into the Fields tab to dig deeper.

Field metrics

The Fields page lists all of the in our schema, sectioned by the type they appear on. Here we can investigate the fields in our , reviewing which clients have requested them and how often.

When our starts to receive more traffic, we can get resolver-level metrics—which let us drill a lot deeper to see what's going on with each and where there might be a higher level of latency.

With a , we can set the sampling rate to be higher; this lets us see -level insights with less traffic.

Slow queries

When we analyze our 's metrics, we can compare which queries are taking the longest to resolve. The Operations page includes a section called Slowest p95 Service Time; here we'll see the names of the , along with the time—either in seconds, or milliseconds, typically—it took for them to resolve.


The Operations page in Studio, highlighting the slowest service time section.

Note: The "p95" indicates that the time given for each is something of an upper limit. 95% of the operation's executions actually complete faster than the reported value, but this way we can more easily see the worst time an operation takes to resolve.

The GetRecipePage stands out here as the slowest —with a whopping three seconds to resolve! Let's look at how we tackle queries with parts that resolve more slowly than others in the next section.


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