Rename latency metric to duration

app/services/spam/spam_verdict_service.rb

@@ -103,7 +103,7 @@ module Spam
     end
 
     def histogram
-      @histogram ||= Gitlab::Metrics.histogram(:spamcheck_latency_seconds, 'Latency to the Spamcheck service')
+      @histogram ||= Gitlab::Metrics.histogram(:gitlab_spamcheck_request_duration_seconds, 'Request duration to the anti-spam service')
     end
   end
 end

doc/administration/monitoring/prometheus/gitlab_metrics.md

@@ -129,7 +129,7 @@ The following metrics are available:
 | `pipeline_graph_links_per_job_ratio`                             | Histogram   | 13.9    | Ratio of links to job per graph                                                                                       |                                                           |
 | `gitlab_ci_pipeline_security_orchestration_policy_processing_duration_seconds` | Histogram   | 13.12    | Time in seconds it takes to process Security Policies in CI/CD pipeline                                                                    |                                                           |
 | `gitlab_ci_difference_live_vs_actual_minutes`                    | Histogram   | 13.12    | Difference between CI minute consumption counted while jobs were running (live) vs when jobs are complete (actual). Used to enforce CI minute consumption limits on long running jobs. | `plan` |
-| `spamcheck_latency_seconds`                                      | Histogram   | 13.12   | The latency for requests between Rails and the anti-spam engine                                                        |                                                           |
+| `gitlab_spamcheck_request_duration_seconds`                      | Histogram   | 13.12   | The duration for requests between Rails and the anti-spam engine                                                        |                                                           |
 
 ## Metrics controlled by a feature flag
 

spec/services/spam/spam_verdict_service_spec.rb

@@ -131,11 +131,11 @@ RSpec.describe Spam::SpamVerdictService do
 
       with_them do
         before do
-          allow(Gitlab::Metrics).to receive(:histogram).with(:spamcheck_latency_seconds, anything).and_return(histogram)
+          allow(Gitlab::Metrics).to receive(:histogram).with(:gitlab_spamcheck_request_duration_seconds, anything).and_return(histogram)
           allow(service).to receive(:spamcheck_verdict).and_return([verdict, attribs, error])
         end
 
-        it 'records latency with labels' do
+        it 'records duration with labels' do
           expect(histogram).to receive(:observe).with(a_hash_including(result: label), anything)
           subject
         end