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docs: add more info on http transactions/span (#95598)

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Brandon Morelli 2021-03-29 08:35:48 -07:00 • committed by GitHub
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docs/apm/service-overview.asciidoc
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@ -38,6 +38,8 @@ image::apm/images/traffic-transactions.png[Traffic and transactions]
=== Error rate and errors
The *Error rate* chart displays the average error rates relating to the service, within a specific time range.
An HTTP response code greater than 400 does not necessarily indicate a failed transaction.
<<transaction-error-rate,Learn more>>.
The *Errors* table provides a high-level view of each error message when it first and last occurred,
along with the total number of occurrences. This makes it very easy to quickly see which errors affect

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docs/apm/transactions.asciidoc
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@ -22,11 +22,21 @@ Visualize response codes: `2xx`, `3xx`, `4xx`, etc.
Useful for determining if more responses than usual are being served with a particular response code.
Like in the latency graph, you can zoom in on anomalies to further investigate them.
[[transaction-error-rate]]
*Error rate*::
Visualize the total number of transactions with errors divided by the total number of transactions.
The error rate value is based on the `event.outcome` field and is the relative number of failed transactions.
Any unexpected increases, decreases, or irregular patterns can be investigated further
with the <<errors,errors overview>>.
The error rate represents the percentage of failed transactions from the perspective of the selected service.
It's useful for visualizing unexpected increases, decreases, or irregular patterns in a service's transactions.
+
[TIP]
====
HTTP **transactions** from the HTTP server perspective do not consider a `4xx` status code (client error) as a failure
because the failure was caused by the caller, not the HTTP server. Thus, there will be no increase in error rate.
HTTP **spans** from the client perspective however, are considered failures if the HTTP status code is ≥ 400.
These spans will increase the error rate.
If there is no HTTP status, both transactions and spans are considered successful unless an error is reported.
====
*Average duration by span type*::
Visualize where your application is spending most of its time.