fix(telemetry): drop the suppressed references the span no longer emits

tx.receive is created after the duplicate check, so it never carries a
suppressed attribute. The Tempo tag filter and the dashboard panel still
referenced it, and check_otel_naming rules C and D fail on a reference with no
constant behind it.

The panel keeps its remaining signal as a plain receive rate. How many relayed
copies were dropped is the transactions_duplicate traffic category, which does
not depend on a span.

The spanmetrics dimension goes too; a dimension for an attribute nothing sets
only widens the label set.

docker/telemetry/grafana/dashboards/transaction-overview.json

@@ -140,8 +140,8 @@
       }
     },
     {
-      "title": "Transaction Receive vs Suppressed",
-      "description": "**What:** Raw transaction messages received from peers, split by whether they were suppressed as duplicates before processing.\n**How it's computed:** Per-second rate split by suppressed flag over a 5-minute window, per node.\n**Reading it:** A healthy relay network produces a steady suppressed share as duplicates are filtered.\n**Healthy range:** Workload-dependent; suppression is expected and normal.\n**Watch for:** A sharp rise in the suppressed line can reflect gossip amplification or a peer replaying transactions.\n**Source:** src/xrpld/overlay/detail/PeerImp.cpp:PeerImp::handleTransaction",
+      "title": "Transaction Receive Rate",
+      "description": "**What:** Transactions received from peers that this node went on to process.\n**How it's computed:** Per-second rate of the tx.receive span over a 5-minute window, per node.\n**Reading it:** Tracks the useful inbound transaction load. Copies dropped as duplicates are not counted here, because the span starts after the duplicate check; their volume is the transactions_duplicate traffic category.\n**Healthy range:** Workload-dependent.\n**Watch for:** A fall to zero while peers are connected means inbound relay has stopped.\n**Source:** src/xrpld/overlay/detail/PeerImp.cpp:PeerImp::handleTransaction",
       "type": "timeseries",
       "gridPos": {
         "h": 8,
@@ -161,8 +161,8 @@
           "datasource": {
             "type": "prometheus"
           },
-          "expr": "sum by (suppressed, service_instance_id) (rate(traces_span_metrics_calls_total{span_name=\"tx.receive\", tx_type=~\"$tx_type\", service_instance_id=~\"$node\", deployment_environment=~\"$deployment_environment\", xrpl_network_type=~\"$xrpl_network_type\", service_name=~\"$service_name\"}[$__rate_interval]))",
-          "legendFormat": "Suppressed={{suppressed}} [{{service_instance_id}}]"
+          "expr": "sum by (service_instance_id) (rate(traces_span_metrics_calls_total{span_name=\"tx.receive\", tx_type=~\"$tx_type\", service_instance_id=~\"$node\", deployment_environment=~\"$deployment_environment\", xrpl_network_type=~\"$xrpl_network_type\", service_name=~\"$service_name\"}[$__rate_interval]))",
+          "legendFormat": "Tx Receive [{{service_instance_id}}]"
         }
       ],
       "fieldConfig": {

docker/telemetry/grafana/provisioning/datasources/tempo.yaml

@@ -186,11 +186,6 @@ datasources:
             operator: "="
             scope: span
             type: dynamic
-          - id: tx-suppressed
-            tag: suppressed
-            operator: "="
-            scope: span
-            type: dynamic
           - id: peer-version
             tag: peer_version
             operator: "="

docker/telemetry/otel-collector-config.yaml

@@ -100,7 +100,6 @@ connectors:
       - name: consensus_mode
       - name: close_time_correct
       - name: local
-      - name: suppressed
       - name: proposal_trusted
       - name: validation_trusted
       - name: tx_type