Merge pull request #51048 from yaarith/pending-release-notes-leaderboard

PendingReleaseNotes: add a note about telemetry leaderboard

Reviewed-by: Laura Flores <lflores@redhat.com>
Reviewed-by: Neha Ojha <nojha@redhat.com>
Reviewed-by: Patrick Donnelly <pdonnell@redhat.com>

Merge pull request #51264 from idryomov/wip-rbd-gtest-skip

test/librbd: use GTEST_SKIP macro to skip tests

Reviewed-by: Prasanna Kumar Kalever <prasanna.kalever@redhat.com>
Reviewed-by: Mykola Golub <mgolub@suse.com>

Merge pull request #51295 from jzhu116-bloomberg/wip-59577

rgw/notification: pass in bytes_transferred to populate object_size in sync notification

Merge pull request #50457 from Matan-B/wip-matanb-c-new-rbd-api

qa/suites/crimson-rados/rbd: Add new rbd image format api tests

Reviewed-by: Samuel Just <sjust@redhat.com>

Merge pull request #50227 from xxhdx1985126/wip-share-map-over-heartbeat

crimson/osd/heartbeat: share osdmap to peers when necessary

Reviewed-by: Samuel Just <sjust@redhat.com>

Merge pull request #51202 from xxhdx1985126/wip-crimson-clone-head-version

crimson/osd/pg: make clone object's version consistent with pglog

Reviewed-by: Sam Just <sjust@redhat.com>
Reviewed-by: Radoslaw Zarzynski <rzarzyns@redhat.com>

Merge pull request #51180 from xxhdx1985126/wip-59511

crimson/osd/snaptrim_event: get SnapSetContext from head obc

Reviewed-by: Matan Breizman <mbreizma@redhat.com>
Reviewed-by: Sam Just <sjust@redhat.com>
Reviewed-by: Radoslaw Zarzynski <rzarzyns@redhat.com>

Merge pull request #47637 from rzarzynski/wip-crimson-blocklist

crimson/osd: bring support for client blocklisting

Reviewed-by: Matan Breizman <mbreizma@redhat.com>
Reviewed-by: Sam Just <sjust@redhat.com>

Merge PR #51158 into main

* refs/pull/51158/head:
cephfs-top: fix help text for delay

Reviewed-by: Neeraj Pratap Singh <neesingh@redhat.com>
Reviewed-by: Venky Shankar <vshankar@redhat.com>

Merge PR #51005 into main

* refs/pull/51005/head:
qa: fix test_nfs_export_creation_at_symlink
qa: update test cases to check for ENOTDIR instead of EINVAL
qa: fix test_nfs_export_with_invalid_path
mgr/nfs: handle exceptions for cephfs_path_is_dir()
mgr/nfs/utils: changes to helper func to check cephfs path

Reviewed-by: Venky Shankar <vshankar@redhat.com>

Merge pull request #51133 from zdover23/wip-doc-2023-04-18-mgr-prometheus-prompts-update

doc/mgr: update prompts in prometheus.rst

Reviewed-by: Cole Mitchell <cole.mitchell.ceph@gmail.com>

Merge pull request #51299 from zdover23/wip-doc-2023-05-02-radosgw-notifications-rabbitmq-push-endpoint-directive-removal

doc/radosgw: rabbitmq - push-endpoint edit

Reviewed-by: Yuval Lifshitz <ylifshit@redhat.com>

Merge pull request #50698 from linuxkidd/wip-rgw-restore-bucket-index-update

rgw: add use of cached `rados ls` output to rgw-restore-bucket-index script

Reviewed-by: J. Eric Ivancich <ivancich@redhat.com>

Merge pull request #51270 from ljflores/wip-telemetry-selftest

mgr/telemetry: compile all channels and collections in selftest

Reviewed-by: Yaarit Hatuka <yaarit@redhat.com>

Merge pull request #51296 from zdover23/wip-doc-2023-05-01-rados-operations-stretch-mode-top-matter

doc/rados: edit stretch-mode.rst

Reviewed-by: Anthony D'Atri <anthony.datri@gmail.com>

Merge pull request #51298 from ljflores/wip-urllib3-version

mgr: add urllib3==1.26.15 to mgr/requirements.txt

doc/rados: edit stretch-mode.rst

Refine and supplement the introductory and explanatory text at the top
of the /doc/rados/operations/stretch-mode.rst file.

Co-authored-by: Josh Durgin <jdurgin@redhat.com>
Co-authored-by: Anthony D'Atri <anthony.datri@gmail.com>
Signed-off-by: Zac Dover <zac.dover@proton.me>

doc/radosgw: rabbitmq - push-endpoint edit

Remove a note that directed users to change "push-endpoint" (with a
hyphen) to "push_endpoint" (with an underscore) when using rabbitmq.

Re: https://github.com/ceph/ceph/pull/48486#issuecomment-1529925389

Signed-off-by: Zac Dover <zac.dover@proton.me>

rgw/notification: read object size from the rados obj when populate sync notification

Signed-off-by: Juan Zhu <jzhu4@dev-10-34-20-139.pw1.bcc.bloomberg.com>

mgr: add urllib3==1.26.15 to mgr/requirements.txt

We do not depend on any particular version of
urllib3, but as a workaround to the incompatibility
of urllib3 constraints between kubernetes and
requests, we need to pin it temporarily to
the version both are happy with.

Fixes: https://tracker.ceph.com/issues/59591
Signed-off-by: Laura Flores <lflores@redhat.com>

Merge pull request #51284 from zdover23/wip-doc-2023-04-29-cephfs-nfs

doc/cephfs: improve sentence in nfs.rst

Merge pull request #51138 from AliMasarweh/wip-alimasa-pubsub-hide-autogen-topics

RGW: bucket notification - hide auto generated topics when listing topics

test/cls_rbd/test_cls_rbd: Skip mirror_image_status (Crimson)

This commit is part of an initial attempt to establish a Crimson testing baseline.

Signed-off-by: Matan Breizman <mbreizma@redhat.com>

qa/suites/crimson-rados/rbd: Add new rbd image format api tests

Signed-off-by: Matan Breizman <mbreizma@redhat.com>

test/librbd: Skip unsupported Crimson tests

This commit is part of an initial attempt to establish a Crimson testing baseline.

test_librbd notes:

* Skip ListChildrenTiered (Crimson):
  Cache tiering is not supported.

test_internal notes:

* Skip SnapshotCopyup (Crimson):
  Clone overlap calculation is WIP: https://tracker.ceph.com/issues/58263

Signed-off-by: Matan Breizman <mbreizma@redhat.com>

Merge pull request #51293 from yuvalif/wip-yuval-revert-47457

revert PRs #47457 and #51031

Reviewed-by: Greg Farnum <gfarnum@redhat.com>

Revert "tracer/osd/librados/build/rgw: rgw and osd end2end tracing using opentelemetry"

This reverts commit 5d4c5e65be94a346e62b9f8ac63241779c4c7a6a.

Signed-off-by: Yuval Lifshitz <ylifshit@redhat.com>

Revert "rgw/aio: fix recursion from tracing changes"

This reverts commit 9f160e4f1aa385f39f1cd55eb42f278c94dfd85c.

Signed-off-by: Yuval Lifshitz <ylifshit@redhat.com>

Merge pull request #51285 from zdover23/wip-doc-2023-04-29-rados-operations-stretch-mode-stretch-mode

doc/rados: edit stretch-mode procedure

Reviewed-by: Anthony D'Atri <anthony.datri@gmail.com>

doc/rados: edit stretch-mode procedure

Edit the "stretch mode" section in doc/rados/operations/stretch-mode.rst
so that the procedure is formatted as a procedure and the sentences
correctly have heads.

Co-authored-by: Anthony D'Atri <anthony.datri@gmail.com>
Signed-off-by: Zac Dover <zac.dover@proton.me>

Merge pull request #51276 from pcuzner/fix-prom-docs

docs: Update the cephadm docs for Prometheus endpoint info

Reviewed-by: Zac Dover <zac.dover@proton.me>

doc/cephfs: improve sentence in nfs.rst

Corect a sentence that should have been corrected in
https://github.com/ceph/ceph/pull/51204.

Signed-off-by: Zac Dover <zac.dover@proton.me>

cephfs-top: fix help text for delay

Updates:

`
  -d {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25}, --delay {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25}
                        Refresh interval in seconds (default: 1)
`

to

`
  -d DELAY, --delay DELAY
                        Refresh interval in seconds (default: 1, range: 1 - 25)
`

Fixes: https://tracker.ceph.com/issues/59553
Signed-off-by: Jos Collin <jcollin@redhat.com>

Merge pull request #51069 from rhcs-dashboard/exporter-prom

exporter: promethize counter names

docs: Update the Prometheus endpoint info

This patch just tidies up some of the links and adds
an example showing how the http_sd_configs option
may be used.

Signed-off-by: Paul Cuzner <pcuzner@redhat.com>

Merge pull request #51271 from zdover23/wip-doc-2023-04-28-rados-configuration-mon-config-ref-background

doc/rados: m-config-ref: edit "background"

Reviewed-by: Anthony D'Atri <anthony.datri@gmail.com>

doc/rados: m-config-ref: edit "background"

Edit the "Background" section of doc/rados/monitor/config-ref.rst

Signed-off-by: Zac Dover <zac.dover@proton.me>

doc/mgr: update prompts in prometheus.rst

Update prompts in prometheus.rst so that they're unselectable.

Signed-off-by: Zac Dover <zac.dover@proton.me>

mgr/telemetry: compile all channels and collections in selftest

The selftest currently compiles only channels and collections that
are on by default. This change tests the compilation of all channels
and collections.

Signed-off-by: Laura Flores <lflores@redhat.com>

crimson/osd/heartbeat: add latest epoch sent concept

Signed-off-by: Matan Breizman <mbreizma@redhat.com>

crimson/osd/shard_services: Add logs to load_map_bls

Signed-off-by: Matan Breizman <mbreizma@redhat.com>

crimson/osd/heartbeat: add a rename todo

In continuation to: bfbbc311f1f

Signed-off-by: Matan Breizman <mbreizma@redhat.com>

crimson/osd/heartbeat: Rename Peer's created at epoch

As these getter and setter represent the epoch at which the peer was added

Signed-off-by: Matan Breizman <mbreizma@redhat.com>

crimson/osd/heartbeat: share osdmap to peers when necessary

Signed-off-by: Xuehan Xu <xxhdx1985126@gmail.com>
Signed-off-by: Matan Breizman <mbreizma@redhat.com>

crimson/osd: drop the OSDMap caching from PG

`PG` directly aggregates both `OSDMap` and `PeeringState` which
maintains its own `OSDMap` instance. This duplication leads to
issues as the `PG::osdmap` never gets updated.

Signed-off-by: Radoslaw Zarzynski <rzarzyns@redhat.com>

crimson/osd: implement watcher blocklisting

Signed-off-by: Radoslaw Zarzynski <rzarzyns@redhat.com>

crimson/osd: check for blocklisted clients

Signed-off-by: Radoslaw Zarzynski <rzarzyns@redhat.com>

test/librbd: use GTEST_SKIP macro to skip tests

The use of SUCCEED macro predates the introduction of GTEST_SKIP macro
to GTest 1.10.  Having skipped tests reported as passed is misleading!

Before:

[ RUN      ] TestMockOperationSnapshotRemoveRequest.FlattenedCloneRemovesChild
SKIPPING
[       OK ] TestMockOperationSnapshotRemoveRequest.FlattenedCloneRemovesChild (9 ms)
...
[ RUN      ] TestMockOperationSnapshotRemoveRequest.RemoveChildError
SKIPPING
[       OK ] TestMockOperationSnapshotRemoveRequest.RemoveChildError (112 ms)
...
[  PASSED  ] 16 tests.

After:

[ RUN      ] TestMockOperationSnapshotRemoveRequest.FlattenedCloneRemovesChild
../src/test/librbd/operation/test_mock_SnapshotRemoveRequest.cc:381: Skipped
Skipping due to unmet REQUIRE
[  SKIPPED ] TestMockOperationSnapshotRemoveRequest.FlattenedCloneRemovesChild (9 ms)
...
[ RUN      ] TestMockOperationSnapshotRemoveRequest.RemoveChildError
../src/test/librbd/operation/test_mock_SnapshotRemoveRequest.cc:727: Skipped
Skipping due to enabled deep-flatten
[  SKIPPED ] TestMockOperationSnapshotRemoveRequest.RemoveChildError (111 ms)
...
[  PASSED  ] 14 tests.
[  SKIPPED ] 2 tests, listed below:
[  SKIPPED ] TestMockOperationSnapshotRemoveRequest.FlattenedCloneRemovesChild
[  SKIPPED ] TestMockOperationSnapshotRemoveRequest.RemoveChildError

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

Merge pull request #50530 from Matan-B/wip-matanb-crimson-only-new-rbd-v2

crimson/osd: Handle rollback to head obejct

Reviewed-by: Samuel Just <sjust@redhat.com>

Merge pull request #50584 from Matan-B/wip-matanb-crimson-only-add-thrash

qa/suites/crimson-rados/thrash: Enable supported tests and ops

Reviewed-by: Samuel Just <sjust@redhat.com>

Merge pull request #51198 from Matan-B/wip-matanb-snap-trimmer-loop

crimson/osd/snaptrim_event: Handle missing clone obc case

Reviewed-by: Samuel Just <sjust@redhat.com>
Reviewed-by: Radosław Zarzyński <rzarzyns@redhat.com>

Merge pull request #51189 from rhcs-dashboard/fix-cephpgimbalance-alert

mgr/dashboard: fix CephPGImbalance alert

Reviewed-by: Avan Thakkar <athakkar@redhat.com>
Reviewed-by: Nizamudeen A <nia@redhat.com>

crimson/osd/snaptrim_event: avoid leaking txn ops for updating head obcs
when removing clones

Signed-off-by: Xuehan Xu <xxhdx1985126@gmail.com>

crimson/osd/snaptrim_event: encode head oi with no oid

This is required by PGBackend::load_metadata

Signed-off-by: Xuehan Xu <xxhdx1985126@gmail.com>

crimson/osd/snaptrim_event: don't clear head obc's snaps

There may be valid snaps for a head object, although some snap is
being removed

Signed-off-by: Xuehan Xu <xxhdx1985126@gmail.com>

Merge pull request #51154 from zdover23/wip-doc-2023-04-20-rados-operations-3-of-x

doc/rados/ops: edit user-management.rst (3 of x)

Reviewed-by: Cole Mitchell <cole.mitchell@gmail.com>

Merge pull request #51204 from zdover23/wip-doc-2023-04-25-cephfs-nfs-ganesha-permissions

doc/cephfs: explain cephfs data and metadata set

Reviewed-by: Anthony D'Atri <anthony.datri@gmail.com>

doc/cephfs: explain cephfs data and metadata set

Explain how to set application metadata for the CephFS data pool and the
CephFS metadata pool.

Signed-off-by: Zac Dover <zac.dover@proton.me>

Merge pull request #51228 from jsoref/spelling-rbd

rbd: fix spelling errors

Reviewed-by: Ilya Dryomov <idryomov@gmail.com>

Merge pull request #51030 from batrick/i59425

qa: check each fs for health

Reviewed-by: Venky Shankar <vshankar@redhat.com>

rbd: fix spelling errors

* acquire
* are
* asynchronous
* attempt
* bootstrap
* concurrent
* consume
* couldn't
* cumulative
* disable
* disabling
* disaster
* disconnected
* endianness
* entries
* exclusive
* filesystem
* flag
* generic
* github
* image
* information
* initiating
* latency
* limitations
* metadata
* modify
* namespace
* noautoconsole
* ourselves
* prefetch
* propagate
* protection
* recorder
* recover
* release
* replicated
* reserved
* selection
* sentinel
* several
* snapshot
* source
* specifying
* suppress
* synchronize
* the
* transfer
* triggering
* unknown
* validation
* version
* visible
* write log entries

Signed-off-by: Josh Soref <2119212+jsoref@users.noreply.github.com>

Merge pull request #50927 from rhcs-dashboard/export-authx

mgr/dashboard: import/export ceph authx users

Reviewed-by: Aashish Sharma <aasharma@redhat.com>
Reviewed-by: Nizamudeen A <nia@redhat.com>

qa: fix test_nfs_export_creation_at_symlink

Signed-off-by: Dhairya Parmar <dparmar@redhat.com>

qa: update test cases to check for ENOTDIR instead of EINVAL

- test_nfs_export_creation_at_filepath:
ENOTDIR is raised instead of EINVAL which is better
aligned with the nature of the failure

- test_nfs_export_creation_at_symlink:
ENOTDIR is raised instead of ENOENT since the code
can now check if the path is symlink but won't follow
it.

Signed-off-by: Dhairya Parmar <dparmar@redhat.com>

qa: fix test_nfs_export_with_invalid_path

It actually didn't test the invalid path but still ended with
ENOENT(which is expected in case path is invalid) as the test
didn't create a fs, and it failed saying "FS nfs-cephfs not found"
which too raises ENOENT and thus it always passed.

Signed-off-by: Dhairya Parmar <dparmar@redhat.com>

mgr/nfs: handle exceptions for cephfs_path_is_dir()
in create_cephfs_export()

Signed-off-by: Dhairya Parmar <dparmar@redhat.com>

mgr/nfs/utils: changes to helper func to check cephfs path

- Renamed to cephfs_path_is_dir

- Removed exception handling to prevent redundant log statements like:
   "No such file or directory error in stat: b'/mnt/testdir_symlink': No such file or directory [Errno 2]"

  Exceptions handled inside caller eliminates this redundancy

- Set modifier flag AT_SYMLINK_NOFOLLOW

- Removed string "{path} is not a dir" when raising NotADirectoryError
  Rationale: will be handled in export.py

- change mock to cephfs_path_is_dir

Signed-off-by: Dhairya Parmar <dparmar@redhat.com>

mgr/dashboard: import/export authx users

Signed-off-by: Pere Diaz Bou <pdiazbou@redhat.com>
Fixes: https://tracker.ceph.com/issues/59486

Merge PR #51223 into main

* refs/pull/51223/head:
Revert "tools/cephfs/top/CMakeList.txt: check the minimum compatible python version for cephfs-top"

Reviewed-by: Jos Collin <jcollin@redhat.com>

Revert "tools/cephfs/top/CMakeList.txt: check the minimum compatible python version for cephfs-top"

Signed-off-by: Venky Shankar <vshankar@redhat.com>

Merge pull request #51193 from zdover23/wip-doc-2023-04-24-start-intro-first-para-rewrite

doc/start: rewrite intro paragraph

doc/start: rewrite intro paragraph

Rewrite the first paragraph in doc/start/intro.rst.

Signed-off-by: Zac Dover <zac.dover@proton.me>
Co-authored-by: Anthony D'Atri <anthony.datri@gmail.com>
Signed-off-by: Zac Dover <zac.dover@proton.me>

Merge pull request #50722 from adk3798/asyncio-cephadm-timeout

mgr/cephadm: asyncio based universal timeout for ssh/cephadm commands

Reviewed-by: John Mulligan <jmulligan@redhat.com>
Reviewed-by: Redouane Kachach <rkachach@redhat.com>

Merge pull request #49103 from adk3798/mon-crush-location

mgr/cephadm: allow setting mon crush locations through mon service spec

Reviewed-by: Anthony D'Atri <anthonyeleven@users.noreply.github.com>
Reviewed-by: Redouane Kachach <rkachach@redhat.com>

Merge pull request #51120 from mgfritch/cephadm-haproxy-offline-host

cephadm: reschedule haproxy from an offline host

Reviewed-by: Adam King <adking@redhat.com>

mgr/cephadm: asyncio based universal timeout for ssh/cephadm commands

Since we already have make use of asyncio for our ssh commands,
we can use asyncio's timeout on waiting for concurrent futures to complete
as a way to have universal timeouts on our cephadm commands.
This change also creates a contextmanager that will catch any asyncio.TimeoutError.
Using the contextmanager along with calls to the wait_async function
will catch any timeout exception raised and convert it into an appropriate
OrchetratorError including information about what and where for the timeout
if it was provided (host where run, what command). This allows us to guarantee a
background ssh command eventually returns and inform users of any
timeouts by raising a health warning or logging the error instead
of sitting idle indefinitely

Fixes: https://tracker.ceph.com/issues/54024
Signed-off-by: Adam King <adking@redhat.com>

mgr/cephadm: pass --timeout to cephadm binary commands

Signed-off-by: Adam King <adking@redhat.com>

Merge pull request #50719 from guits/update-dockerfile-keepalived

contrib: update keepalived Dockerfile

Reviewed-by: Adam King <adking@redhat.com>

qa/suites/crimson-rados/thrash: Enable supported thrashers

Balanced/Localized reads are now supported.
snap_remove and rollback are supported as well.

Signed-off-by: Matan Breizman <mbreizma@redhat.com>

qa/suites/crimson-rados/thrash: Add snap_remove/create weights

Signed-off-by: Matan Breizman <mbreizma@redhat.com>

crimson/osd/pg: PG::on_active_actmap() clear PG_STATE_SNAPTRIM_ERROR

Signed-off-by: Matan Breizman <mbreizma@redhat.com>

crimson/osd/pg: PG::on_active_actmap() fix SnapTrimEvent stop condition

Signed-off-by: Matan Breizman <mbreizma@redhat.com>

crimson/osd/osd_operations/snaptrim_event: Handle missing clone obc

The case where resolve_oid is not able to return the clone oid (in order
to load the clone obc) should result in an SNAPTRIM_ERROR and stop the loop
iteration. Without taking this case into account an infinite loop of snap
trim events will be created.
The ENOENT error is delegated upwards to be handled by PG::on_active_actmap().

Fixes: https://tracker.ceph.com/issues/59231
Signed-off-by: Matan Breizman <mbreizma@redhat.com>

crimson/osd/pg: make clone object's version consistent with pglog

Right now, the head object's version is 1 less than clone object's
version in the pg log; while it's exactly the other way around when
it comes to the versions recorded in the object info of head/clone
objects

Fixes: https://tracker.ceph.com/issues/59536
Signed-off-by: Xuehan Xu <xxhdx1985126@gmail.com>

Merge pull request #49980 from myoungwon/wip-generalize-recordsubmitter

crimson/os/seastore/journal: generalize recordsubmitter

Reviewed-by: Yingxin Cheng <yingxin.cheng@intel.com>

exporter: promethize counter names

Signed-off-by: Pere Diaz Bou <pere-altea@hotmail.com>
Fixes: https://tracker.ceph.com/issues/59475

crimson/osd/osd_operations/snaptrim_event: Add log lines and formatting

Signed-off-by: Matan Breizman <mbreizma@redhat.com>

crimson/osd: get SnapSetContext from head obc

clone obc doesn't have snapset context

Fixes: https://tracker.ceph.com/issues/59511
Signed-off-by: Xuehan Xu <xxhdx1985126@gmail.com>

Merge pull request #51067 from guits/fix-backward-compatible-issue-cv

ceph-volume: fix batch refactor issue

Merge pull request #50838 from guits/osd-replacement-improvements

orchestrator: add `--no-destroy` arg to `ceph orch osd rm`

Merge pull request #50745 from guits/quick-fix-cv

ceph-volume: quick fix in zap.py

mgr/dashboard: fix CephPGImbalance alert

Fixes: https://tracker.ceph.com/issues/55568
Signed-off-by: Aashish Sharma <aasharma@redhat.com>

Merge pull request #51178 from zdover23/wip-doc-2023-04-22-glossary-placement-groups

doc/glossary: add "Placement Groups" definition

Reviewed-by: Anthony D'Atri <anthony.datri@gmail.com>

Merge pull request #51177 from zdover23/wip-doc-2023-04-22-start-documenting-ceph-first-150-lines

doc/start: edit first 150 lines of documenting-ceph

Reviewed-by: Anthony D'Atri <anthony.datri@gmail.com>

doc/start: edit first 50 lines of documenting-ceph

Edit the first 150 lines of doc/start/documenting-ceph.rst. This is part
of an initiative to harvest the fruits of Cephalocon 2023, at which
documentation proved to be in demand to a surprising degree.

Co-authored-by: Anthony D'Atri <anthony.datri@gmail.com>
Signed-off-by: Zac Dover <zac.dover@proton.me>

doc/glossary: add "Placement Groups" definition

Add a definition of "Placement Groups" to the Glossary.

Co-authored-by: Anthony D'Atri <anthony.datri@gmail.com>
Signed-off-by: Zac Dover <zac.dover@proton.me>

Merge pull request #51175 from zdover23/wip-doc-2023-04-21-main-page-docs-link

doc: add link to "documenting ceph" to index.rst

doc: add link to "documenting ceph" to index.rst

Add a link to the landing page of docs.ceph.com to direct documentation
contributors to documentation-related information.

Signed-off-by: Zac Dover <zac.dover@proton.me>

PendingReleaseNotes: add a note about telemetry leaderboard

Signed-off-by: Yaarit Hatuka <yaarit@redhat.com>

Merge pull request #50324 from pkalever/scrub_incomplete

librbd: remove previous incomplete primary snapshot after successfully creating a new one

Reviewed-by: Ilya Dryomov <idryomov@gmail.com>