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docs(develop-docs): Document callback_error discard reason #19218

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msonnb merged 1 commit into from
Sep 2, 2026
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docs(develop-docs): Document callback_error discard reason #19218

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6 changes: 5 additions & 1 deletion develop-docs/sdk/telemetry/client-reports.mdx
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Expand Up @@ -2,12 +2,15 @@
title: Client Reports
description: SDK self-reporting protocol for tracking discarded events and their discard reasons.
spec_id: sdk/telemetry/client-reports
spec_version: 1.23.0
spec_version: 1.24.0
spec_status: stable
spec_depends_on:
- id: sdk/foundations/transport/envelopes
version: ">=1.0.0"
spec_changelog:
- version: 1.24.0
date: 2026-09-01
summary: Added `callback_error` discard reason
- version: 1.23.0
date: 2026-06-22
summary: Added metric byte outcomes for tracking discarded metric data size
Expand Down Expand Up @@ -369,6 +372,7 @@ The following discard reasons are defined for `discarded_events`:
| `ignored` | 1.16.0 | Telemetry item was ignored by the SDK (e.g., a span was ignored by `ignore_spans`; can also be used by other deny-list mechanisms). |
| `invalid` | 1.17.0 | Failed validation (e.g., replay session exceeded maximum allowed length). |
| `no_parent_span` | 1.22.0 | Span was not started or dropped because no parent span was present at span start (for example, auto-instrumented spans suppressed when the request happens outside an active span). |
| `callback_error` | 1.24.0 | A user-provided callback (e.g., `before_send`, `traces_sampler`) threw an error. |

#### Adding a new discard reason:

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