Fix old broken link (#11048)

* link check fixes

* updated link target

* Update aggregations.md

* spelling error

docs/configuration/index.md

@@ -176,12 +176,12 @@ and `druid.tlsPort` properties on each process. Please see `Configuration` secti
 
 #### Jetty Server TLS Configuration
 
-Druid uses Jetty as an embedded web server. To get familiar with TLS/SSL in general and related concepts like Certificates etc.
-reading this [Jetty documentation](http://www.eclipse.org/jetty/documentation/9.4.32.v20200930/configuring-ssl.html) might be helpful.
-To get more in depth knowledge of TLS/SSL support in Java in general, please refer to this [guide](http://docs.oracle.com/javase/8/docs/technotes/guides/security/jsse/JSSERefGuide.html).
-The documentation [here](http://www.eclipse.org/jetty/documentation/9.4.32.v20200930/configuring-ssl.html#configuring-sslcontextfactory)
-can help in understanding TLS/SSL configurations listed below. This [document](http://docs.oracle.com/javase/8/docs/technotes/guides/security/StandardNames.html) lists all the possible
-values for the below mentioned configs among others provided by Java implementation.
+Druid uses Jetty as an embedded web server. To learn more about TLS/SSL, certificates, and related concepts in Jetty, including explanations of the configuration settings below, see "Configuring SSL/TLS KeyStores" in the [Jetty Operations Guide](https://www.eclipse.org/jetty/documentation.php). 
+
+For information about TLS/SSL support in Java in general, see the [Java Secure Socket Extension (JSSE) Reference Guide](http://docs.oracle.com/javase/8/docs/technotes/guides/security/jsse/JSSERefGuide.html).
+The [Java Cryptography Architecture
+Standard Algorithm Name Documentation for JDK 8](http://docs.oracle.com/javase/8/docs/technotes/guides/security/StandardNames.html) lists all possible
+values for the following properties, among others provided by the Java implementation.
 
 |Property|Description|Default|Required|
 |--------|-----------|-------|--------|

docs/development/extensions-contrib/ambari-metrics-emitter.md

@@ -27,8 +27,7 @@ To use this Apache Druid extension, make sure to [include](../../development/ext
 
 ## Introduction
 
-This extension emits Druid metrics to a ambari-metrics carbon server.
-Events are sent after been [pickled](http://ambari-metrics.readthedocs.org/en/latest/feeding-carbon.html#the-pickle-protocol); the size of the batch is configurable.
+This extension emits Druid metrics to an ambari-metrics carbon server. Events are sent after been pickled (i.e., batched). The size of the batch is configurable.
 
 ## Configuration
 

docs/development/extensions-core/datasketches-quantiles.md

@@ -55,7 +55,7 @@ The result of the aggregation is a DoublesSketch that is the union of all sketch
 |type|This String should always be "quantilesDoublesSketch"|yes|
 |name|A String for the output (result) name of the calculation.|yes|
 |fieldName|A String for the name of the input field (can contain sketches or raw numeric values).|yes|
-|k|Parameter that determines the accuracy and size of the sketch. Higher k means higher accuracy but more space to store sketches. Must be a power of 2 from 2 to 32768. See the [Quantiles Accuracy](https://datasketches.apache.org/docs/Quantiles/QuantilesAccuracy) for details. |no, defaults to 128|
+|k|Parameter that determines the accuracy and size of the sketch. Higher k means higher accuracy but more space to store sketches. Must be a power of 2 from 2 to 32768. See [accuracy information](https://datasketches.apache.org/docs/Quantiles/OrigQuantilesSketch) in the DataSketches documentation for details.|no, defaults to 128|
 
 ### Post Aggregators
 

docs/misc/math-expr.md

@@ -72,7 +72,7 @@ The following built-in functions are available.
 |name|description|
 |----|-----------|
 |concat|concat(expr, expr...) concatenate a list of strings|
-|format|format(pattern[, args...]) returns a string formatted in the manner of Java's [String.format](https://docs.oracle.com/javase/8/docs/api/java/lang/String.md#format-java.lang.String-java.lang.Object...-).|
+|format|format(pattern[, args...]) returns a string formatted in the manner of Java's [String.format](https://docs.oracle.com/javase/8/docs/api/java/lang/String.html#format-java.lang.String-java.lang.Object...-).|
 |like|like(expr, pattern[, escape]) is equivalent to SQL `expr LIKE pattern`|
 |lookup|lookup(expr, lookup-name) looks up expr in a registered [query-time lookup](../querying/lookups.md)|
 |parse_long|parse_long(string[, radix]) parses a string as a long with the given radix, or 10 (decimal) if a radix is not provided.|

docs/operations/basic-cluster-tuning.md

@@ -433,10 +433,11 @@ for your specific scenario and be sure to test any changes in staging environmen
 
 Additionally, for large JVM heaps, here are a few Garbage Collection efficiency guidelines that have been known to help in some cases.
 
-- Mount /tmp on tmpfs ( See http://www.evanjones.ca/jvm-mmap-pause.html )
-- On Disk-IO intensive processes (e.g. Historical and MiddleManager), GC and Druid logs should be written to a different disk than where data is written.
-- Disable Transparent Huge Pages ( See https://blogs.oracle.com/linux/performance-issues-with-transparent-huge-pages-thp )
-- Try disabling biased locking by using `-XX:-UseBiasedLocking` JVM flag. ( See https://dzone.com/articles/logging-stop-world-pauses-jvm )
+
+- Mount /tmp on tmpfs. See [The Four Month Bug: JVM statistics cause garbage collection pauses](http://www.evanjones.ca/jvm-mmap-pause.html).
+- On Disk-IO intensive processes (e.g., Historical and MiddleManager), GC and Druid logs should be written to a different disk than where data is written.
+- Disable [Transparent Huge Pages](https://www.kernel.org/doc/html/latest/admin-guide/mm/transhuge.html).
+- Try disabling biased locking by using `-XX:-UseBiasedLocking` JVM flag. See [Logging Stop-the-world Pauses in JVM](https://dzone.com/articles/logging-stop-world-pauses-jvm).
 
 ### Use UTC timezone
 

docs/operations/pull-deps.md

@@ -49,7 +49,7 @@ A local repository that Maven will use to put downloaded files. Then pull-deps w
 
 `-r` or `--remoteRepository`
 
-Add a remote repository. Unless --no-default-remote-repositories is provided, these will be used after https://repo1.maven.org/maven2/ and https://metamx.artifactoryonline.com/metamx/pub-libs-releases-local
+Add a remote repository. Unless `--no-default-remote-repositories` is provided, these will be used after https://repo1.maven.org/maven2/ and http://metamx.artifactoryonline.com/metamx/pub-libs-releases-local
 
 `--no-default-remote-repositories`
 

docs/querying/aggregations.md

@@ -395,7 +395,7 @@ The [Approximate Histogram](../development/extensions-core/approximate-histogram
 
 The algorithm used by this deprecated aggregator is highly distribution-dependent and its output is subject to serious distortions when the input does not fit within the algorithm's limitations.
 
-A [study published by the DataSketches team](https://datasketches.apache.org/docs/Quantiles/DruidApproxHistogramStudy.html) demonstrates some of the known failure modes of this algorithm:
+A [study published by the DataSketches team](https://datasketches.apache.org/docs/QuantilesStudies/DruidApproxHistogramStudy.html) demonstrates some of the known failure modes of this algorithm:
 
 - The algorithm's quantile calculations can fail to provide results for a large range of rank values (all ranks less than 0.89 in the example used in the study), returning all zeroes instead.
 - The algorithm can completely fail to record spikes in the tail ends of the distribution

website/.spelling

@@ -283,6 +283,7 @@ javadoc
 joinable
 kerberos
 keystore
+KeyStores
 keytab
 kubernetes
 laning