Update cheatsheets

kcat

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# kcat
+
+> Apache Kafka producer and consumer tool.
+> More information: <https://github.com/edenhill/kcat>.
+
+- Consume messages starting with the newest offset:
+
+`kcat -C -t {{topic}} -b {{brokers}}`
+
+- Consume messages starting with the oldest offset and exit after the last message is received:
+
+`kcat -C -t {{topic}} -b {{brokers}} -o beginning -e`
+
+- Consume messages as a Kafka consumer group:
+
+`kcat -G {{group_id}} {{topic}} -b {{brokers}}`
+
+- Publish message by reading from `stdin`:
+
+`echo {{message}} | kcat -P -t {{topic}} -b {{brokers}}`
+
+- Publish messages by reading from a file:
+
+`kcat -P -t {{topic}} -b {{brokers}} {{path/to/file}}`
+
+- List metadata for all topics and brokers:
+
+`kcat -L -b {{brokers}}`
+
+- List metadata for a specific topic:
+
+`kcat -L -t {{topic}} -b {{brokers}}`
+
+- Get offset for a topic/partition for a specific point in time:
+
+`kcat -Q -t {{topic}}:{{partition}}:{{unix_timestamp}} -b {{brokers}}`