Documentation Index
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Metric tags with unbounded values that create many time series
user_id, request_id, session_id, trace_id, ip_address, full URLs, timestamps, and raw error messages.
Each unique tag value creates a separate time series for the metric. A user_id tag on a latency metric creates one time series per user for each metric and dimension combination.
| Signal | Description |
|---|---|
| Unbounded value set | The tag can contain thousands or millions of distinct values. |
| Per-request or per-user values | The tag contains identifiers such as users, sessions, requests, traces, or IP addresses. |
| Sparse series | Many generated time series have little data per series. |
| Limited query value | The tag is not used in dashboards, alerts, or common queries. |
http_request_duration_seconds{service="api", endpoint="/users", user_id="usr_abc123"} 0.045
http_request_duration_seconds{service="api", endpoint="/users", user_id="usr_def456"} 0.052
http_request_duration_seconds{service="api", endpoint="/users", user_id="usr_ghi789"} 0.038
http_request_duration_seconds{service="api", endpoint="/users"} 0.045
id: remove-user-id-tag
name: Remove user_id tag from metrics
description: Drop high-cardinality user_id tag. Creates millions of sparse time series.
metric:
match:
- tag: user_id
exists: true
transform:
remove_tags:
- user_id