diff --git a/javascript/sentry-conventions/src/attributes.ts b/javascript/sentry-conventions/src/attributes.ts
index 9690ba2b..e4e72f9b 100644
--- a/javascript/sentry-conventions/src/attributes.ts
+++ b/javascript/sentry-conventions/src/attributes.ts
@@ -7471,6 +7471,26 @@ export const SENTRY_STATUS_MESSAGE = 'sentry.status.message';
  */
 export type SENTRY_STATUS_MESSAGE_TYPE = string;
 
+// Path: model/attributes/sentry/sentry__timestamp__sequence.json
+
+/**
+ * A sequencing counter for deterministic ordering of logs or metrics when timestamps share the same integer millisecond. Starts at 0 on SDK initialization, increments by 1 for each captured item, and resets to 0 when the integer millisecond of the current item differs from the previous one. `sentry.timestamp.sequence`
+ *
+ * Attribute Value Type: `number` {@link SENTRY_TIMESTAMP_SEQUENCE_TYPE}
+ *
+ * Contains PII: false
+ *
+ * Attribute defined in OTEL: No
+ *
+ * @example 0
+ */
+export const SENTRY_TIMESTAMP_SEQUENCE = 'sentry.timestamp.sequence';
+
+/**
+ * Type for {@link SENTRY_TIMESTAMP_SEQUENCE} sentry.timestamp.sequence
+ */
+export type SENTRY_TIMESTAMP_SEQUENCE_TYPE = number;
+
 // Path: model/attributes/sentry/sentry__trace__parent_span_id.json
 
 /**
@@ -9334,6 +9354,7 @@ export const ATTRIBUTE_TYPE: Record<string, AttributeType> = {
   [SENTRY_SPAN_SOURCE]: 'string',
   [SENTRY_STATUS_CODE]: 'integer',
   [SENTRY_STATUS_MESSAGE]: 'string',
+  [SENTRY_TIMESTAMP_SEQUENCE]: 'integer',
   [SENTRY_TRACE_PARENT_SPAN_ID]: 'string',
   [SENTRY_TRANSACTION]: 'string',
   [SERVER_ADDRESS]: 'string',
@@ -9765,6 +9786,7 @@ export type AttributeName =
   | typeof SENTRY_SPAN_SOURCE
   | typeof SENTRY_STATUS_CODE
   | typeof SENTRY_STATUS_MESSAGE
+  | typeof SENTRY_TIMESTAMP_SEQUENCE
   | typeof SENTRY_TRACE_PARENT_SPAN_ID
   | typeof SENTRY_TRANSACTION
   | typeof SERVER_ADDRESS
@@ -14145,6 +14167,17 @@ export const ATTRIBUTE_METADATA: Record<AttributeName, AttributeMetadata> = {
     example: 'foobar',
     changelog: [{ version: '0.3.1', prs: [190] }],
   },
+  [SENTRY_TIMESTAMP_SEQUENCE]: {
+    brief:
+      'A sequencing counter for deterministic ordering of logs or metrics when timestamps share the same integer millisecond. Starts at 0 on SDK initialization, increments by 1 for each captured item, and resets to 0 when the integer millisecond of the current item differs from the previous one.',
+    type: 'integer',
+    pii: {
+      isPii: 'false',
+    },
+    isInOtel: false,
+    example: 0,
+    changelog: [{ version: 'next', prs: [262] }],
+  },
   [SENTRY_TRACE_PARENT_SPAN_ID]: {
     brief:
       'The span id of the span that was active when the log was collected. This should not be set if there was no active span.',
@@ -15259,6 +15292,7 @@ export type Attributes = {
   [SENTRY_SPAN_SOURCE]?: SENTRY_SPAN_SOURCE_TYPE;
   [SENTRY_STATUS_CODE]?: SENTRY_STATUS_CODE_TYPE;
   [SENTRY_STATUS_MESSAGE]?: SENTRY_STATUS_MESSAGE_TYPE;
+  [SENTRY_TIMESTAMP_SEQUENCE]?: SENTRY_TIMESTAMP_SEQUENCE_TYPE;
   [SENTRY_TRACE_PARENT_SPAN_ID]?: SENTRY_TRACE_PARENT_SPAN_ID_TYPE;
   [SENTRY_TRANSACTION]?: SENTRY_TRANSACTION_TYPE;
   [SERVER_ADDRESS]?: SERVER_ADDRESS_TYPE;
diff --git a/model/attributes/sentry/sentry__timestamp__sequence.json b/model/attributes/sentry/sentry__timestamp__sequence.json
new file mode 100644
index 00000000..2863458d
--- /dev/null
+++ b/model/attributes/sentry/sentry__timestamp__sequence.json
@@ -0,0 +1,16 @@
+{
+  "key": "sentry.timestamp.sequence",
+  "brief": "A sequencing counter for deterministic ordering of logs or metrics when timestamps share the same integer millisecond. Starts at 0 on SDK initialization, increments by 1 for each captured item, and resets to 0 when the integer millisecond of the current item differs from the previous one.",
+  "type": "integer",
+  "pii": {
+    "key": "false"
+  },
+  "is_in_otel": false,
+  "example": 0,
+  "changelog": [
+    {
+      "version": "next",
+      "prs": [262]
+    }
+  ]
+}
diff --git a/python/src/sentry_conventions/attributes.py b/python/src/sentry_conventions/attributes.py
index f49af2ce..0f2c980e 100644
--- a/python/src/sentry_conventions/attributes.py
+++ b/python/src/sentry_conventions/attributes.py
@@ -4199,6 +4199,18 @@ class ATTRIBUTE_NAMES(metaclass=_AttributeNamesMeta):
     Example: 200
     """
 
+    # Path: model/attributes/sentry/sentry__timestamp__sequence.json
+    SENTRY_TIMESTAMP_SEQUENCE: Literal["sentry.timestamp.sequence"] = (
+        "sentry.timestamp.sequence"
+    )
+    """A sequencing counter for deterministic ordering of logs or metrics when timestamps share the same integer millisecond. Starts at 0 on SDK initialization, increments by 1 for each captured item, and resets to 0 when the integer millisecond of the current item differs from the previous one.
+
+    Type: int
+    Contains PII: false
+    Defined in OTEL: No
+    Example: 0
+    """
+
     # Path: model/attributes/sentry/sentry__trace__parent_span_id.json
     SENTRY_TRACE_PARENT_SPAN_ID: Literal["sentry.trace.parent_span_id"] = (
         "sentry.trace.parent_span_id"
@@ -9114,6 +9126,16 @@ class ATTRIBUTE_NAMES(metaclass=_AttributeNamesMeta):
             ChangelogEntry(version="0.4.0", prs=[223, 228]),
         ],
     ),
+    "sentry.timestamp.sequence": AttributeMetadata(
+        brief="A sequencing counter for deterministic ordering of logs or metrics when timestamps share the same integer millisecond. Starts at 0 on SDK initialization, increments by 1 for each captured item, and resets to 0 when the integer millisecond of the current item differs from the previous one.",
+        type=AttributeType.INTEGER,
+        pii=PiiInfo(isPii=IsPii.FALSE),
+        is_in_otel=False,
+        example=0,
+        changelog=[
+            ChangelogEntry(version="next", prs=[262]),
+        ],
+    ),
     "sentry.trace.parent_span_id": AttributeMetadata(
         brief="The span id of the span that was active when the log was collected. This should not be set if there was no active span.",
         type=AttributeType.STRING,
@@ -10229,6 +10251,7 @@ class ATTRIBUTE_NAMES(metaclass=_AttributeNamesMeta):
         "sentry.span.source": str,
         "sentry.status.message": str,
         "sentry.status_code": int,
+        "sentry.timestamp.sequence": int,
         "sentry.trace.parent_span_id": str,
         "sentry.transaction": str,
         "server.address": str,