Update docker.io/prom/prometheus Docker tag to v3.11.2

v3.11.2: 3.11.2 / 2026-04-13

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This release has a fix for a Stored XSS vulnerability that can be triggered via crafted metric names and label values in Prometheus web UI tooltips and metrics explorer. Thanks to Duc Anh Nguyen from TinyxLab for reporting it.

• [SECURITY] UI: Fix stored XSS via unescaped metric names and labels. CVE-2026-40179. #​18506
• [ENHANCEMENT] Consul SD: Introduce health_filter field for Health API filtering. #​18499
• [BUGFIX] Consul SD: Fix filter parameter being incorrectly applied to the Health API. #​18499

v3.11.1: 3.11.1 / 2026-04-07

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• [BUGFIX] Tracing: Fix startup failure for OTLP HTTP tracing with insecure: true. #​18469

v3.11.0: 3.11.0 / 2026-04-02

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• [CHANGE] Hetzner SD: The __meta_hetzner_datacenter label is deprecated for the role robot but kept for backward compatibility, use the __meta_hetzner_robot_datacenter label instead. For the role hcloud, the label is deprecated and will stop working after the 1 July 2026. #​17850
• [CHANGE] Hetzner SD: The __meta_hetzner_hcloud_datacenter_location and __meta_hetzner_hcloud_datacenter_location_network_zone labels are deprecated, use the __meta_hetzner_hcloud_location and __meta_hetzner_hcloud_location_network_zone labels instead. #​17850
• [CHANGE] Promtool: Redirect debug output to stderr to avoid interfering with stdout-based tool output. #​18346
• [FEATURE] AWS SD: Add Elasticache Role. #​18099
• [FEATURE] AWS SD: Add RDS Role. #​18206
• [FEATURE] Azure SD: Add support for Azure Workload Identity authentication method. #​17207
• [FEATURE] Discovery: Introduce prometheus_sd_last_update_timestamp_seconds metric to track the last time a service discovery update was sent to consumers. #​18194
• [FEATURE] Kubernetes SD: Add support for node role selectors for pod roles. #​18006
• [FEATURE] Kubernetes SD: Introduce pod-based labels for deployment, cronjob, and job controller names: __meta_kubernetes_pod_deployment_name, __meta_kubernetes_pod_cronjob_name and __meta_kubernetes_pod_job_name, respectively. #​17774
• [FEATURE] PromQL: Add </ and >/ operators for trimming observations from native histograms. #​17904
• [FEATURE] PromQL: Add experimental histogram_quantiles variadic function for computing multiple quantiles at once. #​17285
• [FEATURE] TSDB: Add storage.tsdb.retention.percentage configuration to configure the maximum percent of disk usable for TSDB storage. #​18080
• [FEATURE] TSDB: Add an experimental st-storage feature flag. When enabled, Prometheus stores ingested start timestamps (ST, previously called Created Timestamp) from scrape or OTLP in the TSDB and Agent WAL, and exposes them via Remote Write 2. #​18062
• [FEATURE] TSDB: Add an experimental xor2-encoding feature flag for the new TSDB block float sample chunk encoding that is optimized for scraped data and allows encoding start timestamps. #​18062
• [ENHANCEMENT] HTTP client: Add AWS external_id support for sigv4. #​17916
• [ENHANCEMENT] Kubernetes SD: Deduplicate deprecation warning logs from the Kubernetes API to reduce noise. #​17829
• [ENHANCEMENT] TSDB: Remove old temporary checkpoints when creating a Checkpoint. #​17598
• [ENHANCEMENT] UI: Add autocomplete support for experimental first_over_time and ts_of_first_over_time PromQL functions. #​18318
• [ENHANCEMENT] Vultr SD: Upgrade govultr library from v2 to v3 for continued security patches and maintenance. #​18347
• [PERF] PromQL: Improve performance and reduce heap allocations in joins (VectorBinop)/And/Or/Unless. #​17159
• [PERF] PromQL: Partially address performance regression in native histogram aggregations due to using KahanAdd. #​18252
• [PERF] Remote write: Optimize WAL watching used for RW sending to reuse internal buffers. #​18250
• [PERF] TSDB: Optimize LabelValues intersection performance for matchers. #​18069
• [PERF] UI: Skip restacking on hover in stacked series charts. #​18230
• [BUGFIX] AWS SD: Fix EC2 SD ignoring the configured endpoint option, a regression from the AWS SDK v2 migration. #​18133
• [BUGFIX] AWS SD: Fix panic in EC2 SD when DescribeAvailabilityZones returns nil ZoneName or ZoneId. #​18133
• [BUGFIX] Agent: Fix memory leak caused by duplicate SeriesRefs being loaded as active series. #​17538
• [BUGFIX] Alerting: Fix alert state incorrectly resetting to pending when the FOR period is increased in the config file. #​18244
• [BUGFIX] Azure SD: Fix system-assigned managed identity not working when client_id is empty. #​18323
• [BUGFIX] Consul SD: Fix filter parameter not being applied to health service endpoint, causing Node and Node.Meta filters to be ignored. #​17349
• [BUGFIX] Kubernetes SD: Fix duplicate targets generated by *DualStack EndpointSlices policies. #​18192
• [BUGFIX] OTLP: Fix ErrTooOldSample being returned as HTTP 500 instead of 400 in PRW v2 histogram write paths, preventing infinite client retry loops. #​18084
• [BUGFIX] OTLP: Fix exemplars getting mixed between incorrect parts of a histogram. #​18056
• [BUGFIX] PromQL: Do not skip histogram buckets in queries where histogram trimming is used. #​18263
• [BUGFIX] Remote write: Fix prometheus_remote_storage_sent_batch_duration_seconds measuring before the request was sent. #​18214
• [BUGFIX] Rules: Fix alert state restoration when rule labels contain Go template expressions. #​18375
• [BUGFIX] Scrape: Fix panic when parsing bare label names without an equal sign in brace-only metric notation. #​18229
• [BUGFIX] TSDB: Fail early when use-uncached-io feature flag is set on unsupported environments. #​18219
• [BUGFIX] TSDB: Fall back to CLI flag values when retention is removed from config file. #​18200
• [BUGFIX] TSDB: Fix memory leaks in buffer pools by clearing reference fields before returning buffers to pools. #​17895
• [BUGFIX] TSDB: Fix missing mmap of histogram chunks during WAL replay. #​18306
• [BUGFIX] TSDB: Fix storage.tsdb.retention.time unit mismatch in file causing retention to be 1e6 times longer than configured. #​18200
• [BUGFIX] Tracing: Fix missing traceID in query log when tracing is enabled, previously only spanID was emitted. #​18189
• [BUGFIX] UI: Fix tooltip Y-offset drift when using multiple graph panels. #​18228
• [BUGFIX] UI: Update retention display in runtime info when config is reloaded. #​18200