Labeler: STEM Labeler (did:plc:et54engghtqyu3myyjzzssak)

This is a labeler service. It publishes labels about posts and accounts on the Bluesky network.

Labeler

STEM Labeler
did:plc:et54engghtqyu3myyjzzssak

Classification

Declared declared

Reachability

accessible

Auditability

high

Class

third_party

First seen

24 Feb 2026, 9:08 PM UTC

Last seen

25 Apr 2026, 7:53 PM UTC

Events (24h)

Events (7d)

0 Silent volume

Targets (7d)

Subjects (7d)

Alerts

Coverage

100% coverage

Links

Open on Bluesky · PLC directory

Derived scores as of 25 Apr 2026, 8:56 PM UTC

Why classified this way

Reason: declared+did_service+did_label_key+probe_accessible+observed_src

Classifier version: v1

Classified at: 2026-04-25T19:53:28.981189Z

Evidence surfaces

declared_record: true (2026-04-25T19:53:28.981189Z)

did_doc_label_key: true (2026-04-25T19:53:28.981189Z)

did_doc_labeler_service: https://ozone.stemlabels.xyz (2026-04-25T19:53:28.981189Z)

probe_result: accessible (2026-04-25T19:53:28.981189Z)

declared_record: true (2026-04-24T19:37:01.302821Z)

did_doc_label_key: true (2026-04-24T19:37:01.302821Z)

did_doc_labeler_service: https://ozone.stemlabels.xyz (2026-04-24T19:37:01.302821Z)

probe_result: down (2026-04-24T19:37:01.302821Z)

declared_record: true (2026-04-23T19:27:01.632909Z)

did_doc_label_key: true (2026-04-23T19:27:01.632909Z)

did_doc_labeler_service: https://ozone.stemlabels.xyz (2026-04-23T19:27:01.632909Z)

probe_result: down (2026-04-23T19:27:01.632909Z)

did_doc_label_key: true (2026-04-22T19:26:00.040567Z)

did_doc_labeler_service: https://ozone.stemlabels.xyz (2026-04-22T19:26:00.040567Z)

declared_record: true (2026-04-22T19:22:24.424052Z)

did_doc_label_key: true (2026-04-22T19:22:24.424052Z)

did_doc_labeler_service: https://ozone.stemlabels.xyz (2026-04-22T19:22:24.424052Z)

probe_result: down (2026-04-22T19:22:24.424052Z)

declared_record: true (2026-04-22T16:31:23.366276Z)

did_doc_label_key: true (2026-04-22T16:31:23.366276Z)

Probe history

ts	status	http	latency	failure
25 Apr 2026, 7:53 PM UTC	accessible	200	344ms
24 Apr 2026, 7:37 PM UTC	down		8093ms	timeout
23 Apr 2026, 7:27 PM UTC	down		8099ms	timeout
22 Apr 2026, 7:22 PM UTC	down		8030ms	timeout
22 Apr 2026, 4:31 PM UTC	down		8102ms	timeout
22 Apr 2026, 6:04 AM UTC	down		8042ms	timeout
21 Apr 2026, 3:53 AM UTC	accessible	200	314ms
20 Apr 2026, 12:54 AM UTC	accessible	200	289ms
18 Apr 2026, 10:20 PM UTC	accessible	200	448ms
17 Apr 2026, 8:30 PM UTC	accessible	200	248ms

Alerts timeline

id	rule_id	ts
61940	data_gap	22 Apr 2026, 1:44 AM UTC
61877	data_gap	21 Apr 2026, 9:27 PM UTC
56723	label_rate_spike	8 Apr 2026, 8:24 PM UTC
56216	churn_index	7 Apr 2026, 11:24 AM UTC
56202	churn_index	7 Apr 2026, 10:44 AM UTC
56183	churn_index	7 Apr 2026, 10:11 AM UTC
56164	churn_index	7 Apr 2026, 9:38 AM UTC
56141	churn_index	7 Apr 2026, 9:02 AM UTC
56121	churn_index	7 Apr 2026, 8:24 AM UTC
56098	churn_index	7 Apr 2026, 7:50 AM UTC
56075	churn_index	7 Apr 2026, 7:18 AM UTC
56062	label_rate_spike	7 Apr 2026, 6:45 AM UTC
56065	churn_index	7 Apr 2026, 6:45 AM UTC
56054	label_rate_spike	7 Apr 2026, 6:12 AM UTC
56059	churn_index	7 Apr 2026, 6:12 AM UTC
55997	label_rate_spike	7 Apr 2026, 4:24 AM UTC
55988	label_rate_spike	7 Apr 2026, 3:17 AM UTC
55981	data_gap	7 Apr 2026, 2:10 AM UTC
55350	label_rate_spike	5 Apr 2026, 6:58 AM UTC
52441	flip_flop	29 Mar 2026, 8:19 AM UTC
52419	flip_flop	29 Mar 2026, 7:53 AM UTC
52416	flip_flop	29 Mar 2026, 7:48 AM UTC
52414	flip_flop	29 Mar 2026, 7:44 AM UTC
52412	flip_flop	29 Mar 2026, 7:18 AM UTC
52410	flip_flop	29 Mar 2026, 7:15 AM UTC
52389	flip_flop	29 Mar 2026, 6:47 AM UTC
52387	flip_flop	29 Mar 2026, 6:42 AM UTC
52366	flip_flop	29 Mar 2026, 6:39 AM UTC
52365	flip_flop	29 Mar 2026, 6:13 AM UTC
51891	data_gap	28 Mar 2026, 6:16 AM UTC
51495	data_gap	27 Mar 2026, 8:04 AM UTC
51492	data_gap	27 Mar 2026, 8:00 AM UTC
51489	data_gap	27 Mar 2026, 7:30 AM UTC
51485	data_gap	27 Mar 2026, 7:26 AM UTC
51462	data_gap	27 Mar 2026, 6:57 AM UTC
51458	data_gap	27 Mar 2026, 6:52 AM UTC
51454	data_gap	27 Mar 2026, 6:24 AM UTC
51447	data_gap	27 Mar 2026, 6:20 AM UTC
51423	data_gap	27 Mar 2026, 5:50 AM UTC
51420	data_gap	27 Mar 2026, 5:47 AM UTC

Methods and caveats

What is a labeler? A third-party service that publishes tags (labels) about Bluesky posts or accounts. Clients choose which labelers to subscribe to and how to interpret labels (ignore / warn / hide).
This site observes labeler behavior only. No content analysis, no user profiling, no moderation actions.
Rules detect geometric patterns (rate anomalies, target distribution, churn). Thresholds are configurable.
Every alert includes a receipted hash over rule_id, config, inputs, and evidence for reproducibility.
Sparklines show hourly event counts over 7 days. Badges summarize which rules fired in the period.
Observation surface: label events from com.atproto.label.queryLabels and labeler declarations from com.atproto.sync.listReposByCollection. Does not observe content, profiles, or social graph.
Classification is based on structured evidence from multiple surfaces (registry declaration, DID document, endpoint probing, observed label activity). Each labeler page includes a "Why classified this way" expander with full evidence.