Cache::Value cache_value = cache->LookupOrCreate(key);
  EXPECT_EQ(cache_value.request_count, 1);

  cache_value = cache->LookupOrCreate(key);
  EXPECT_EQ(cache_value.request_count, 2);

  cache_value = cache->LookupOrCreate(key);
  EXPECT_EQ(cache_value.request_count, 3);
}

TEST(DeviceCompilationCacheTest, RequestCountUnchangedOnStore) {
  auto cache = std::make_unique<Cache>();

    Status compilation_status;
    int64_t request_count = 0;
    const XlaCompiler::CompilationResult* compilation_result = nullptr;
    ExecutableType* executable = nullptr;
  };

  // Returns std::nullopt if value for the supplied key is not found. If a value
  // is found, `request_count` is incremented before returning the value.
  std::optional<Value> Lookup(const Key& key) const;

          - /monitor
          - --stackdriver-prefix={{ prometheus_to_sd_prefix }}/addons
          - --api-override={{ prometheus_to_sd_endpoint }}
          - --source=metadata_proxy:http://127.0.0.1:989?whitelisted=request_count
          - --pod-id=$(POD_NAME)
          - --namespace-id=$(POD_NAMESPACE)
        env:
          - name: POD_NAME
            valueFrom:
              fieldRef:
                fieldPath: metadata.name

			expected: map[string]metricsConfig{
				"prometheus": {
					ClientMetrics: metricConfig{
						Disabled: false,
						Overrides: []metricsOverride{
							{
								Name: "REQUEST_COUNT",
								Tags: []tagOverride{
									{Name: "destination_canonical_service", Remove: true},
								},
							},
						},
					},
					ServerMetrics: metricConfig{
						Disabled: true,
					},

apiVersion: telemetry.istio.io/v1alpha1
kind: Telemetry
metadata:
  name: ns-default
spec:
  metrics:
  - providers:
    - name: prometheus
    overrides:
    - match:
        metric: REQUEST_COUNT
      tagOverrides:
        response_code:
          value: "istio_responseClass"
        request_operation: 
          value: istio_operationId
        grpc_response_status: 

  // cache eviction.
  mutex_lock cluster_compile_lock(*cluster_mutex);
  auto cache_value = cache_->LookupOrCreate(signature);

  int64_t current_request_count = cache_value.request_count;
  VLOG(2) << "Compilation cache entry hit: "
          << static_cast<int>(cache_value.compile_state)
          << " signature: " << human_signature << " with request count "
          << current_request_count;

					// Next, get all matches.
					// This is a bit funky because the matches are oneof of ENUM and customer metric. We normalize
					// these to strings, so we may end up with a list like [REQUEST_COUNT, my-customer-metric].
					// TODO: we always flatten ALL_METRICS into each metric mode. For some stats providers (prometheus),
					// we are able to apply overrides to all metrics directly rather than duplicating the config.

                                  Valid Options: ALL_METRICS, REQUEST_COUNT, REQUEST_DURATION, REQUEST_SIZE, RESPONSE_SIZE, TCP_OPENED_CONNECTIONS, TCP_CLOSED_CONNECTIONS, TCP_SENT_BYTES, TCP_RECEIVED_BYTES, GRPC_REQUEST_MESSAGES, GRPC_RESPONSE_MESSAGES
                                enum:
                                - ALL_METRICS
                                - REQUEST_COUNT
                                - REQUEST_DURATION

                                  Valid Options: ALL_METRICS, REQUEST_COUNT, REQUEST_DURATION, REQUEST_SIZE, RESPONSE_SIZE, TCP_OPENED_CONNECTIONS, TCP_CLOSED_CONNECTIONS, TCP_SENT_BYTES, TCP_RECEIVED_BYTES, GRPC_REQUEST_MESSAGES, GRPC_RESPONSE_MESSAGES
                                enum:
                                - ALL_METRICS
                                - REQUEST_COUNT
                                - REQUEST_DURATION

                                  Metrics.
                                enum:
                                - ALL_METRICS
                                - REQUEST_COUNT
                                - REQUEST_DURATION
                                - REQUEST_SIZE
                                - RESPONSE_SIZE
                                - TCP_OPENED_CONNECTIONS