Linux Foundation OTCA Certification Exam Sample Questions

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Linux Foundation OTCA Sample Questions:

01. A metrics pipeline's memory use climbs steadily in production. Investigation shows one Histogram is recorded with a per-request attribute holding a unique user ID, producing a very large number of distinct time series.
Which change most directly controls the growth?
a) Increase the span attribute count limit so more attributes are kept
b) Configure a View that drops the high-cardinality user-ID attribute from the instrument
c) Switch the Histogram to a Counter so that far fewer individual measurements are recorded
d) Add a second exporter so the series are split across two backends
 
02. During a migration to the stable HTTP semantic conventions, an engineer finds instrumentation still emitting the deprecated http.method attribute.
Which stable attribute replaces http.method?
a) http.request.method
b) url.path
c) http.response.status_code
d) http.route
 
03. A backend that stores counters as running totals is receiving metrics from an SDK configured to export cumulative values, and a colleague proposes switching every metric export to delta temporality to save space.
Why should the temporality be chosen with care rather than switched blindly?
a) Temporality only affects traces, so the change has no effect on metrics
b) Delta temporality is always more accurate and should be used everywhere
c) Changing the temporality setting renames each metric and breaks every existing query that selects it by name
d) Cumulative reports a running total while delta reports the change since the last export
 
04. An outbound HTTP client span and an inbound HTTP server span are instrumented for the same request. A reviewer expects each to carry the URL in the attribute appropriate to its side.
Which pairing matches the stable HTTP conventions?
a) The client span uses url.full; the server span uses url.scheme with url.path
b) Both spans record only http.route
c) The client span uses url.path, and the server span records url.full instead of the parts
d) Both spans record url.full and nothing else
 
05. Two services emit the same kind of telemetry but were built against different versions of the semantic conventions, so an attribute was renamed between versions.
What lets a consumer translate the telemetry between those convention versions?
a) Raising the Collector's log level so the rename is printed
b) A schema URL plus a schema file describing the version changes
c) A second exporter that simply resends all of the telemetry under both the old and the new attribute names
d) A sampler configured to drop the older version's spans
 
06. After a library upgrade, a team's traces show both http.status_code and http.response.status_code on the same HTTP spans.
What most likely explains both attributes appearing together?
a) The SDK, by default, always emits every deprecated attribute alongside its stable replacement form
b) Two exporters are configured, so each writes one of the attributes
c) The opt-in is set to emit both old and new HTTP attributes
d) The Collector duplicates every span attribute by default
 
07. Traces are complete within each service, but whenever a request crosses from one service to the next the downstream spans start brand-new traces instead of continuing the caller's trace.
Which misconfiguration best explains this?
a) The sampler is set to AlwaysOn in every service
b) No matching propagator is configured, so trace context is not carried across the hop
c) The exporter endpoint points at the wrong port
d) The services use a BatchSpanProcessor rather than a SimpleSpanProcessor for export
 
08. An operator needs to inspect a running Collector’s live, in-process trace and pipeline activity from a browser, without routing any data to an external backend.
Which extension exposes these live diagnostic pages?
a) The zpages extension
b) The health_check extension
c) The pprof extension
d) The file_storage extension
 
09. Database spans from one service include db.system.name and db.operation.name but never db.query.text, even though the instrumentation supports capturing it.
What is the most likely reason the full query text is omitted?
a) The full statement is always reconstructed automatically from db.operation.name
b) Capturing the full statement is opt-in because it can be high-cardinality and may contain sensitive data
c) The attribute was removed from the stable database conventions, so instrumentation can no longer set it
d) Instrumentation is forbidden from recording any attribute marked Recommended
 
10. A team wants request-rate and latency metrics derived automatically from the spans already flowing through the Collector, without instrumenting new metrics.
Which component produces metrics from span data?
a) The otlp exporter
b) The batch processor
c) The spanmetrics connector
d) The prometheus receiver

Answers:

Question: 01
Answer: b		 Question: 02
Answer: a		 Question: 03
Answer: d		 Question: 04
Answer: a		 Question: 05
Answer: b
Question: 06
Answer: c		 Question: 07
Answer: b		 Question: 08
Answer: a		 Question: 09
Answer: b		 Question: 10
Answer: c

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