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fix(telemetry): build grouped legend labels in the in-repo Alloy config

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The docker/telemetry/alloy/config.alloy node config feeds Grafana Cloud via the
OTLP gateway (which promotes resource attributes to labels server-side). Add the
resource_group / iac_group build to its metric resource statements so nodes
using this Alloy path get the same grouped legend labels the dashboards expect.

This is a generic node config (no perf-iac attrs), so iac_group's guard never
fires here and only resource_group is built; the iac_group statement is kept for
parity and activates automatically on a perf-comparison node. Guards check != ""
as well as != nil since OTTL Concat emits a stray separator for an empty element.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
Pratik Mankawde
2026-07-14 18:36:22 +01:00
parent e93be29ccb
commit 2bb9ebef65
1 changed files with 12 additions and 0 deletions
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12
docker/telemetry/alloy/config.alloy
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@@ -163,6 +163,18 @@ otelcol.processor.transform "tier" {
`delete_key(attributes, "telemetry.sdk.language")`,
`delete_key(attributes, "telemetry.sdk.name")`,
`delete_key(attributes, "telemetry.sdk.version")`,
// Grouped legend labels for the Grafana dashboards (kept in sync with the
// reference collector's transform/legendgroups). The Cloud gateway
// promotes these resource attributes to Prometheus labels server-side.
// * resource_group: node id, optionally suffixed with network type.
// * iac_group: perf-iac branch/role/work-item. A generic node like this
// one does not set those attrs, so the guard leaves iac_group unset;
// it is built only on perf-comparison nodes. The guard checks != ""
// as well as != nil because OTTL Concat emits a stray separator for an
// empty element.
`set(attributes["resource_group"], attributes["service.instance.id"]) where attributes["service.instance.id"] != nil and attributes["service.instance.id"] != ""`,
`set(attributes["resource_group"], Concat([attributes["resource_group"], attributes["xrpl.network.type"]], "-")) where attributes["resource_group"] != nil and attributes["xrpl.network.type"] != nil and attributes["xrpl.network.type"] != ""`,
`set(attributes["iac_group"], Concat([attributes["xrpl.branch"], attributes["xrpl.node.role"], attributes["xrpl.work.item"]], "-")) where attributes["xrpl.branch"] != nil and attributes["xrpl.branch"] != "" and attributes["xrpl.node.role"] != nil and attributes["xrpl.node.role"] != "" and attributes["xrpl.work.item"] != nil and attributes["xrpl.work.item"] != ""`,
]
}