Quick Answer
The answer is IncomingRecords. This CloudWatch metric for Kinesis Firehose directly counts the number of records received by the delivery stream, making it the precise measure for monitoring processing volume and setting a threshold alarm. IncomingBytes, by contrast, tracks data size in bytes rather than record count, while DeliveryToS3.Success reflects successful deliveries to S3 but not the raw record intake. On the AWS Certified Data Engineer Associate DEA-C01 exam, this question tests your ability to distinguish between Firehose-specific metrics and those belonging to Kinesis Data Streams, such as PutRecord.Success, which is a per-API call metric for streams, not Firehose. A common trap is confusing byte-based metrics with record-based ones, so remember: for record counts, think “IncomingRecords” as the direct pipeline input. A helpful memory tip is to associate “Records” with the count of individual data items, while “Bytes” measures weight—if you need to know how many items entered the stream, always pick the metric with “Records” in its name.
This DEA-C01 practice question tests your understanding of data operations and support. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A data engineer needs to monitor the number of records processed by a Kinesis Data Firehose delivery stream and set an alarm if the count drops below a threshold. Which CloudWatch metric should be used?
IncomingRecords
This metric counts the number of records sent to Firehose.
PutRecord.Success
Why wrong: This is for Kinesis Data Streams, not Firehose.
DeliveryToS3.Success
Why wrong: This indicates successful deliveries, not record count.
IncomingBytes
Why wrong: This measures bytes, not record count.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
IncomingRecords
Option A is correct because 'IncomingRecords' counts records received by Firehose, which directly indicates processing volume. Option B is wrong because 'IncomingBytes' measures bytes, not records. Option C is wrong because 'DeliveryToS3.Success' is a success metric but measures successful deliveries, not record count. Option D is wrong because 'PutRecord.Success' is a per-API call metric for Kinesis Data Streams, not Firehose.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
IncomingRecords
Why this is correct
This metric counts the number of records sent to Firehose.
Related concept
Read the scenario before looking for a memorised answer.
PutRecord.Success
Why it's wrong here
This is for Kinesis Data Streams, not Firehose.
DeliveryToS3.Success
Why it's wrong here
This indicates successful deliveries, not record count.
IncomingBytes
Why it's wrong here
This measures bytes, not record count.
Common exam traps
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Identify which DEA-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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FAQ
Data Operations and Support — This question tests Data Operations and Support — Read the scenario before looking for a memorised answer..
The correct answer is: IncomingRecords — Option A is correct because 'IncomingRecords' counts records received by Firehose, which directly indicates processing volume. Option B is wrong because 'IncomingBytes' measures bytes, not records. Option C is wrong because 'DeliveryToS3.Success' is a success metric but measures successful deliveries, not record count. Option D is wrong because 'PutRecord.Success' is a per-API call metric for Kinesis Data Streams, not Firehose.
Identify which DEA-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 20, 2026
This DEA-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DEA-C01 exam.
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