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fix: alloy instance duplication bug #162

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Merged
amdove merged 1 commit into from
Mar 4, 2026
Merged

fix: alloy instance duplication bug #162

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17 changes: 16 additions & 1 deletion python-pulumi/src/ptd/pulumi_resources/grafana_alloy.py
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Original file line number Diff line number Diff line change
Expand Up @@ -493,12 +493,27 @@ def _define_config_map(

prometheus.scrape "blackbox" {{
targets = prometheus.exporter.blackbox.front_door.targets
forward_to = [prometheus.relabel.default.receiver]
forward_to = [prometheus.relabel.blackbox.receiver]
clustering {{
enabled = true
}}
}}

// Normalize instance label for blackbox metrics to deduplicate across Alloy pods.
// Each pod runs its own blackbox exporter, producing metrics with different
// instance labels (node hostnames). Replacing instance with a static value
// ensures Mimir deduplicates them, preventing duplicate alerts.
// See: https://github.com/grafana/alloy/issues/1009
prometheus.relabel "blackbox" {{
forward_to = [prometheus.relabel.default.receiver]

rule {{
action = "replace"
target_label = "instance"
replacement = "blackbox"
}}
}}

prometheus.scrape "pods" {{
targets = discovery.relabel.pod_metrics.output
forward_to = [prometheus.relabel.default.receiver]
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