diff --git a/packages/opentelemetry-instrumentation-bedrock/opentelemetry/instrumentation/bedrock/__init__.py b/packages/opentelemetry-instrumentation-bedrock/opentelemetry/instrumentation/bedrock/__init__.py
index d54bde1d8a..53a818b8ad 100644
--- a/packages/opentelemetry-instrumentation-bedrock/opentelemetry/instrumentation/bedrock/__init__.py
+++ b/packages/opentelemetry-instrumentation-bedrock/opentelemetry/instrumentation/bedrock/__init__.py
@@ -493,7 +493,12 @@ class GuardrailMeters:
 
 class PromptCaching:
     # will be moved under the AI SemConv. Not namespaced since also OpenAI supports this.
-    LLM_BEDROCK_PROMPT_CACHING = "gen_ai.prompt.caching"
+    # FR: canonical name uses an underscore (`gen_ai.prompt_caching`) to match the
+    # FortifyRoot backend metric contract / catalog and the span attribute
+    # `CacheSpanAttrs.CACHED`. Prometheus normalizes both forms to
+    # `gen_ai_prompt_caching`, but the OTel/contract name must match exactly for
+    # registry, discovery, and SDK/backend round-trips.
+    LLM_BEDROCK_PROMPT_CACHING = "gen_ai.prompt_caching"
 
 
 def _create_metrics(meter: Meter):
diff --git a/packages/opentelemetry-instrumentation-bedrock/tests/metrics/test_bedrock_prompt_caching_metrics.py b/packages/opentelemetry-instrumentation-bedrock/tests/metrics/test_bedrock_prompt_caching_metrics.py
index abc6ddd523..099f393ee7 100644
--- a/packages/opentelemetry-instrumentation-bedrock/tests/metrics/test_bedrock_prompt_caching_metrics.py
+++ b/packages/opentelemetry-instrumentation-bedrock/tests/metrics/test_bedrock_prompt_caching_metrics.py
@@ -1,3 +1,7 @@
+# NOTE:
+# This file has been modified by FortifyRoot.
+# Original source: https://github.com/traceloop/openllmetry
+
 import json
 
 import pytest
@@ -6,6 +10,18 @@
 from opentelemetry.instrumentation.bedrock.prompt_caching import CacheSpanAttrs
 
 
+def test_prompt_caching_metric_name_is_canonical():
+    # The Bedrock prompt-caching counter must be emitted with the canonical
+    # FortifyRoot/backend contract name `gen_ai.prompt_caching` (underscore),
+    # matching the span attribute `CacheSpanAttrs.CACHED` and the backend metric
+    # catalog. Prometheus collapses `gen_ai.prompt.caching` and
+    # `gen_ai.prompt_caching` to the same series, but the OTel/contract name must
+    # match exactly for registry/discovery and SDK/backend round-trips.
+    assert PromptCaching.LLM_BEDROCK_PROMPT_CACHING == "gen_ai.prompt_caching"
+    assert CacheSpanAttrs.CACHED == "gen_ai.prompt_caching"
+    assert PromptCaching.LLM_BEDROCK_PROMPT_CACHING == CacheSpanAttrs.CACHED
+
+
 def call(brt):
     body = {
         "anthropic_version": "bedrock-2023-05-31",