Track custom anonymous usage statistics from ingester and querier

[pracucci]

What this PR does

In this PR I'm adding some custom metrics tracked by the anonymous usage stats tracker, that could help us better understand how Mimir is used (and its scale in the wild). The following custom metrics are tracked:

• Querier
  • querier_remote_read_requests
  • querier_instant_query_requests
  • querier_range_query_requests
  • querier_exemplars_query_requests
  • querier_labels_query_requests
  • querier_series_query_requests
  • querier_metadata_query_requests
  • querier_cardinality_query_requests
• Ingester
  • ingester_replication_factor
  • ingester_inmemory_series
  • ingester_inmemory_tenants
  • ingester_appended_samples
  • ingester_appended_exemplars
• All
  • blocks_storage_backend

The GetInt() and GetCounter() logic has been copied from Loki and I would like to keep it as closest as possible, to be able to move it to a common library in a follow up work.

Known issue: if a report fails to send, we need to try to send the same exact report, because counters are reset each time we build a new one. I will do some refactoring to fix in a follow up PR.

Which issue(s) this PR fixes or relates to

Part of #1815.

Checklist

• Tests updated
• Documentation added
• CHANGELOG.md updated - the order of entries should be [CHANGE], [FEATURE], [ENHANCEMENT], [BUGFIX]

[colega]

LGTM! This was straightforward.

[github-actions]

Helm <> Jsonnet Diff

⚠️ A difference was detected between the Helm chart and the Jsonnet library.

1. Use make check-helm-jsonnet-diff to reproduce the output locally.
2. This test is experimental while we gather feedback about its usefulness.
3. It does not block your PR from being merged, but we would appreciate you trying to keep feature parity between the Helm chart and Jsonnet library if possible.

If you get stuck on this step and the Mimir maintainers aren't able to help, feel free to merge without making this step pass and tag @Logiraptor so the Mimir maintainers can gather feedback later.

Please see the contribution docs here for more info.

Expand to see the output

Output of https://github.com/grafana/mimir/actions/runs/2834030252

Warning: policy/v1beta1 PodDisruptionBudget is deprecated in v1.21+, unavailable in v1.25+; use policy/v1 PodDisruptionBudget
diff -r -u -N scratch/./helm/07-config/ingester-MimirConfig.yml scratch/./jsonnet/08-config/ingester-MimirConfig.yml
--- scratch/./helm/07-config/ingester-MimirConfig.yml	2022-08-10 16:05:30.469191258 +0000
+++ scratch/./jsonnet/08-config/ingester-MimirConfig.yml	2022-08-10 16:05:38.073325427 +0000
@@ -553,7 +553,7 @@
     max_fetched_chunks_per_query: 2000000 (default)
     max_fetched_series_per_query: 0 (default)
     max_global_exemplars_per_user: 0 (default)
-    max_global_series_per_metric: 20000 (default)
+    max_global_series_per_metric: 0
     max_global_series_per_user: 150000 (default)
     max_label_name_length: 1024 (default)
     max_label_names_per_series: 30 (default)
diff -r -u -N scratch/./helm/07-config/overrides-exporter-MimirConfig.yml scratch/./jsonnet/08-config/overrides-exporter-MimirConfig.yml
--- scratch/./helm/07-config/overrides-exporter-MimirConfig.yml	2022-08-10 16:05:30.477191399 +0000
+++ scratch/./jsonnet/08-config/overrides-exporter-MimirConfig.yml	2022-08-10 16:05:38.077325499 +0000
@@ -498,7 +498,7 @@
     max_fetched_chunks_per_query: 2000000 (default)
     max_fetched_series_per_query: 0 (default)
     max_global_exemplars_per_user: 0 (default)
-    max_global_series_per_metric: 20000 (default)
+    max_global_series_per_metric: 0
     max_global_series_per_user: 150000 (default)
     max_label_name_length: 1024 (default)
     max_label_names_per_series: 30 (default)