message: remove commit_cache metric
diff: @@ -150,7 +150,6 @@ impl Debug for ContractRuntime {
  pub struct ContractRuntimeMetrics {
  run_execute: Histogram,
  apply_effect: Histogram,
  - commit_cache: Histogram,
  commit_upgrade: Histogram,
  run_query: Histogram,
  commit_step: Histogram,
  @@ -181,8 +180,6 @@ const RUN_EXECUTE_NAME: &str = "contract_runtime_run_execute";
  const RUN_EXECUTE_HELP: &str = "tracking run of engine_state.run_execute in seconds.";
  const APPLY_EFFECT_NAME: &str = "contract_runtime_apply_commit";
  const APPLY_EFFECT_HELP: &str = "tracking run of engine_state.apply_effect in seconds.";
  -const COMMIT_CACHE_NAME: &str = "contract_runtime_write_values";
  -const COMMIT_CACHE_HELP: &str = "tracking run of engine_state.write_values in seconds.";
  const RUN_QUERY_NAME: &str = "contract_runtime_run_query";
  const RUN_QUERY_HELP: &str = "tracking run of engine_state.run_query in seconds.";
  const COMMIT_STEP_NAME: &str = "contract_runtime_commit_step";
  @@ -237,11 +234,6 @@ impl ContractRuntimeMetrics {
  APPLY_EFFECT_NAME,
  APPLY_EFFECT_HELP,
  )?,
  - commit_cache: register_histogram_metric(
  - registry,
  - COMMIT_CACHE_NAME,
  - COMMIT_CACHE_HELP,
  - )?,
  run_query: register_histogram_metric(registry, RUN_QUERY_NAME, RUN_QUERY_HELP)?,
  commit_step: register_histogram_metric(registry, COMMIT_STEP_NAME, COMMIT_STEP_HELP)?,
  commit_upgrade: register_histogram_metric(
  